What is Depth: Definition and 362 Discussions

A depth charge is an anti-submarine warfare (ASW) weapon. It is intended to destroy a submarine by being dropped into the water nearby and detonating, subjecting the target to a powerful and destructive hydraulic shock. Most depth charges use high explosive charges and a fuze set to detonate the charge, typically at a specific depth. Depth charges can be dropped by ships, patrol aircraft, and helicopters.
Depth charges were developed during World War I, and were one of the first effective methods of attacking a submarine underwater. They were widely used in World War I and World War II. They remained part of the anti-submarine arsenals of many navies during the Cold War. Depth charges have now largely been replaced by anti-submarine homing torpedoes.

A depth charge fitted with a nuclear warhead is also known as a "nuclear depth bomb". These were designed to be dropped from a patrol plane or deployed by an anti-submarine missile from a surface ship, or another submarine, located a safe distance away. By the late 1990s all nuclear anti-submarine weapons had been withdrawn from service by the United States, the United Kingdom, France, Russia and China. They have been replaced by conventional weapons whose accuracy and range had improved greatly as ASW technology improved.

View More On Wikipedia.org
Recent contents Top users
  1. L

    Calculating Penetration Depth for TIR of Evanescent Waves at Glass-Air Interface

    Homework Statement : Calculate the penetration depth of an evanescent wave undergoing TIR from glass (n = 1.5) to air interface, such that the amplitute is reduced to 1/e times its original value. Wavelength of the incident light is 5000 angstroms and 60 degrees. First make sure that incident...
  2. W

    Possible title: How Deep Can a Tank be Filled Without the Window Failing?

    Given: A Large tank has a plastic window on one wall that is designed to withstand a force of 90,000N. The square window is 2m on a side, and its lower edge is 1m from the bottom of the tank. Question: a) if the tank is filled to a depth of 4 m, will the window withstand the resulting force? b)...
  3. M

    Calculating the Depth of a Well and Velocity of a Rock Using Equations of Motion

    1. A rock is dropped into a well of an unknown depth. 20 seconds after the rock is dropped the splash is heard at the top of the well. What is the depth of the well? What is the velocity of the rock when it reached the bottom?2. X= Xo + Vo(t) + 0.5(a)(t^2) V= Vo + a(t) (V^2)= (Vo^2) + 2a(X-Xo)...
  4. B

    Density as a function of depth

    Homework Statement Show that the density of water at a depth z in the ocean is related to the surface density rho_s by \rho(z) \approx \rho_s [1 + (\rho_s g/B)z] where B is the bulk modulus of water. Homework Equations B = -V (dP/dV) B = rho (dP/d rho) 3. The Attempt at a Solution I've...
  5. W

    Skin depth: Same for current as for incoming EM wave?

    For a good conductor, an incoming plane electromagnetic wave will be attenuated exponentially as it penetrates a distance ##z## into the conductor, ##|\vec{E}(z)| = |\vec{E_0}|e^{-z/ \delta}##. ##\delta## is called the "skin depth". The current generated by this incoming electromagnetic wave is...
  6. fricke

    Particle in a box with the finite depth

    For particle in a box with the finite depth, is it traveling wave? or standing wave? I am confused with its ability to pass through the potential walls that is classically forbidden area which makes me think it is traveling wave. But for particle in a box with infinite potential, I understand...
  7. J

    Determining depth & volume relationship with bathymetry data

    I have Bathymetry data which gives the depth-area-volume relationship of a lake. I have determined the area-volume relationship using the function Area=A*Vol^B. Now I'm not sure how to determine the similar relationship between depth and volume. Can I use the same function i.e. Depth=A*Vol^B? I...
  8. B

    Communication systems -- Find the Modulation Depth....

    Homework Statement Hello, the plot in the image shows a modulated signal s(t), with one period of the modulating signal m(t). The mean value of m(t) is equal to zero . Its asked me to find the modulated index, the amplitude of the carrier, the equation of the message(m(t)) and the kind of...
  9. J

    Determine equivalent vacuum for water depth

    Hello, I need to figure out the max water depth a motor will operate without water ingress. The plan is to use a vacuum pump to create differential pressure and correlate that to water depth. My issue is the correlation between the vacuum and pressure. Can someone please provide a formula for...
  10. R

    Using Waves to Find Depth of Well

    Homework Statement [/B] A student uses an audio oscillator of adjustable frequency to measure the depth of a dried up well. Two successive resonances are heard at 17.0Hz and 23.8Hz. The speed of sound in air is 343 m/s. How deep is the well?Homework Equations f=nv/4L The Attempt at a Solution...
  11. Christian Grey

    Which book is better in terms of Depth?

    The Theoretical Minimum: Quantum Mechanics - https://www.amazon.com/dp/0465062903/?tag=pfamazon01-20 Sakurai Modern Quantum Mechanics - http://www.amazon.com/dp/0201539292/?tag=pfamazon01-20 I want to know, which book covers more in depth? And Sakurai's book is more advanced than Leonard...
  12. P

    How to obtain a kinetic model involving bioremediation rate

    good day all. I'm new in the area of bioremediation. Please is there any kinetic model relating bioremediation rate to temperature, depth, PH & Nutrient? if not, how can I model one? a simplified explanation,links & simple literature is also welcome. Many thanks
  13. D

    Derive the Gunn-Peterson optical depth expression....

    Homework Statement Derive an expression for the Gunn-Peterson optical depth Tau(λ) for Lyman limit absorption from smoothly distributed intergalactic neutral Hydrogen of comoving density n0 toward a QSO of emission redshift zem. Take the absorption cross section for Lyman-limit absorption to...
  14. S

    How Do Longer UV Wavelengths Penetrate Deeper into Photopolymers?

    For a photopolymer, the heuristic goes that longer wavelengths of UV light penetrate deeper than shorter wavelengths of UV light. For example, the UVA spectrum penetrates more deeply into the photopolymer than the UVC spectrum. What is the best way for this to be explained?
  15. D

    What is the Depth of the Potential Well for an Odd Bound State Solution?

    Homework Statement The odd bound state solution to the potential well problem bears many similarities to the zero angular momentum solution to the 3D spherical potential well. Assume the range of the potential is 2.3 × 10^−13 cm, the binding energy is -2.9 MeV, and the mass of the particle is...
  16. G

    Understanding Skin Depth in DC and AC Fields: Confusion and Clarification

    Hello. The skin depth is nothing but measure of penetration depth of EM Wave when it is incident on the conductor. It is well known that the skin depth is decreased when the EM wave frequency increases. But thinking about DC field. We know that when DC is applied to metal (metal is installed...
  17. Suraj M

    Calculating RI of Oil w.r.t Air with Apparent Depth of Liquid

    Homework Statement This is how my teacher dictated the question... ---A layer of oil 3 cm thick is floating on a layer of coloured water 5 cm thick, the RI of the coloured water with respect to the oil is ##\frac{5}{3}##. The apparent depth of the liquid is ##\frac{36}{7} cm##. What is the RI...
  18. PrincessIceFall

    How to find the depth of immersion of this boat model?

    So I am trying to find the depth of immersion of this particular boat model, which has curvilinear edges (subparabolic edges) on each side. The figure of the pontoon is shown below So now when I place this pontoon in water, the height of the water that rises, called the depth of immersion is...
  19. B

    What Factors Affect Ultrasound Penetration Depth?

    Hi, I want to calculate the penetration depth of some different frequency ultrasound transducers. I know that it depends on the attenuation of the medium but not sure where these types of figures will be hiding. I assume that once the dB lost for the depth is equal to the dB generated, this is...
  20. S

    Apparent Depth of Light Bulb above Water and Mirror

    Homework Statement Hey, so there is a light bulb above a tank of water which has a mirror at the bottom. I am trying to find the apparent depth of the image of the light produced by the mirror. Finding the apparent depth of the mirror is easy, but I am confused on what to consider the object...
  21. JesseJC

    Engineering Depth of math in engineering disciplines

    generally, how abstract can engineering programs get? i thoroughly enjoy physics and calculus, but, I'm also taking an introductory discrete mathematics course and i find it excruciatingly dull to the point where i can hardly even concentrate on it. what does this mean? if i go further into...
  22. V

    Finding two possibilities of depth when volume is given?

    Homework Statement Problem - If the volume of the carry-on luggage is 2000 cubic inches, determine two possibilities for its depth. Where necessary, round to the nearest tenth of an inch Homework Equations V(x) = x(x+10)(30-2x) Volume function is given above The Attempt at a Solution I...
  23. S

    How Is the Refractive Index Calculated from Apparent and Real Depths?

    Homework Statement Hi. I need help with homework. the correct answers have been provided in the question. one doesn't match with mine and the other does. I don't understand how the one answer can be correct when its dependent on my incorrect answer. A transparent cube of 15cm edge contains a...
  24. B

    Temperature Below 0 at Depth: Find x_min

    Homework Statement Determine at what depth below the surface the temperature never falls below zero. Homework Equations \theta(x)=\bar{\theta}+\theta_0\cos\left(\omega t-\sqrt{\dfrac{\omega}{2D}}x\right)\exp\left(-\sqrt{\dfrac{\omega}{2D}}x\right) where the average is \bar{\theta}=2.5 and...
  25. Y

    Why does temperature decrease with depth underwater?

    Seems like an easy question yet I can't find an answer. Obviously the surface layer of the ocean gets more sunlight but I don't think that is the reason deep water is colder. The increase in pressure usually increases the temperature but this seems to be the exception. Thanks for taking the time...
  26. T

    In depth Mars flight trajectory studies

    Can anyone point me in the direction of any published scientific work involving the study of Earth to Mars flight trajectories? I am thinking of researching this topic for a project and I would like to know about the work that has already been done.
  27. Henry R

    MHB How Do You Write a Function for Depth First Search in Graph Traversal?

    Hello... how to write the function of depth first search? Thank you.
  28. M

    MHB A decision tree has an expected depth of at least log n

    Hey! :o I am looking at the proof of the following theorem and I have some questions. The theorem is the following: The proof is the following: Let $D(T)$ be the sum of the depths of the leaves of a binary rtee $T$. Let $D(m)$ be the smallest value of $D(T)$ taken over all binary trees $T$...
  29. beowulf.geata

    Current density and skin depth

    Homework Statement A thin metallic strip on a circuit board has length L, width a and thickness t, with L>>a>> t. Derive an expression for the resistance between the ends of the strip at frequency f, assuming that the skin depth is small compared with the thickness t. Homework Equations The...
  30. evinda

    MHB Finding Depth of Perfect & Complete Binary Trees

    Hi! (Wave) How can we find the depth of a perfect binary tree and how of a complete one? (Thinking) Since a perfect binary tree is a full binary tree, at which the leaves have the same depth, I thought that we can find the depth, by just looking at the leftmost nodes, like that...
  31. evinda

    MHB Writing an Algorithm to Check Depth of Leaves in an Ordered Tree

    Hello! (Wave) I want to write an algorithm, that implements an ordered tree(not necessary binary tree). It should check if all the leaves of the ordered tree (that is implemented from the binary tree) are at the same depth. Could you give me some hints how I could do this? (Thinking)
  32. lep11

    Measuring the depth of a lake using a bottle

    Homework Statement To measure the depth of a lake, an empty bottle (V=1dm^3) is lowered to the bottom of the freshwater lake. There is a weight attached to the bottom of the bottle to keep it upright. When the bottle is recovered it is filled with 0,58dm^3 of water. Determine the depth of the...
  33. B

    Can a Ship Enter a Harbor? Calculating Depth Using h(t) = 3 + 2sin(0.5236t)

    Homework Statement h(t) = 3 + 2sin(0.5236t) h = depth in meters (water) t = number of hours after 7 1) A certain ship can only enter the harbor if the depth is 4.5m or more. For how long can this ship stay at the harbor? Homework EquationsThe Attempt at a Solution I tried getting both of the...
  34. gfd43tg

    Is Depth-First Search Order for Graph Traversal Direction-Agnostic?

    Hello, I drew up this graph to try and understand the concept of depth-first search. Starting at node C, I was wondering if its correct for the order to be C-A-B-D or C-B-A-D? It seems like you can traverse in either direction without a problem.
  35. A

    MHB Breadth First and Depth First Spanning Trees

    Hi, I'm currently stuck on how to construct a breadth first and depth first spanning tree for this graph, the algorithm that I'm following is somewhat ambiguous. I'd really appreciate if someone can provide an explanation on how I should go by doing this. Thanks
  36. O

    Determination of density at a depth in a compressible fluid.

    Determination of density at a depth in a compressible liquid. Hi all, Let us consider a tank containing some compressible liquid with bulk modulus K and having density at its surface s. Consider some part of liquid with volume V, a depth h below the surface. Due to liquid above it there...
  37. M

    P-N Junction Depth: Affect on Semiconductor Device Performance

    Hi, Could anyone explain how the affect that P-N junction depth has on the performance of a semiconductor device? Are there any devices which would benefit from having a much larger junction depth?
  38. T

    Buoyancy, depth a block will sink in two different liquids

    Homework Statement 4. The bottom half of a tank is filled with water (ρ = 1.0 x 103 kg/m3), and the top half is filled with oil (ρ = 0.85 x 103 kg/m3). Suppose that a rectangular block of wood of mass 5.5 kg, 30 cm long, 20 cm wide and 10 cm high is placed in this tank. How deep will the...
  39. R

    Voltage on a conductor due to skin depth

    As we know due to skin depth effect the Alternating Current flows at a depth from the conductor surface (which means there is no voltage on the surface of the conductor, it is only at a depth from the surface). Then how is it possible for voltage to get appeared across some other conductor...
  40. L

    Superconductor coherence length and penetration depth

    Homework Statement I have a lot of information about 2 different superconductor materials; indium and lead. The indium is pretty much 100% indium with no impurities, and the lead is unknown purity. I have the temperatures and magnetic fields at which they are superconducting and the...
  41. 2

    Should I study D. S. Processing or control theory in greater depth?

    I'm studying CE and math. My computer engineering course is basically electronic/electrical engineering with extra software. I have a choice between the two subject combinations below. Additionally, 1. I'm studying two mechatronic control theory subject, and a mathematical control theory...
  42. M

    Depth of a Water Well by dropping a rock

    Homework Statement A man drops a rock into a well. He hears the sound of the splash 3.2 seconds after he releases the rock from rest. The speed of sound in air (at the local ambient condition) is 338 m/s (a) How far below the top of the well is the surface of the water? (round your...
  43. A

    Calculating Apparent Depth of Print Beneath Flint Glass Plate

    Homework Statement A flint glass plate 3.5 cm thick is placed over a newspaper. How far beneath the top surface of the plate would the print appear to be if you were looking almost vertically downward through the plate? Homework Equations N=1.66 for flint glass Apparent = d/n The...
  44. R

    Depth using Work, Weight, Height

    Homework Statement A diver weighing 784 N stands on a diving board 13.6 m above the surface of a pool. The diver steps off the edge and falls into the pool. The pool does -12290 J of work on the diver. How far below the surface of the pool (depth) does the diver reach? Homework Equations...
  45. M

    Building an underwater quadcopter

    Hi, I am building an underwater quadcopter and I need a depth/altitude sensor for the platform to automatically keep the same altitude above the seabed. I have done some research and I could not find anywhere an off the shelf depth sensor so I figured that I will make one myself, so I...
  46. S

    Determine depth of a well using the speed of sound

    Homework Statement If you drop a stone into a deep well and hear a splash 4.68s after dropping the stone, how far down is the water level? Neglect air resistance and assume that the speed of the sound in air is 3.40x10^2 m/s Homework Equations v=d/t d=v1t+1/2at^2 The Attempt at a Solution Here...
  47. M

    Total pressure at a depth in a fluid

    Hello, I would just like some clarification on this... When you calculate "total" pressure at a depth in a fluid do you have to add on the value for atmospheric pressure?? Thanks, Molly :-)
  48. karush

    MHB Find rate of change of the depth of water when the water is 8 ft deep

    A conical tank (with the vertex down) is $10 \text{ ft}$ across the top and $12 \text{ ft}$ deep. If water is flowing into the tank at rate of $\displaystyle\frac{10 \text{ ft}^3}{\text{min}}$ Find the rate of change of the depth of the water when the water is $8 \text{ ft}$ deep...
  49. J

    Modeling soil temperature at a depth of 5ft

    Hello everyone, This isn't really my area of expertise, so I am looking for a bit of guidance. I wish to estimate the temperature underground at a depth of 5ft. The climate is Saskatchewan (Canada) so it is covered with snow in the winter, and fairly hot in the summer. There is no tree...
  50. W

    Finding an increase in depth, pressure and thrust

    Homework Statement A cylindrical tank of radius 4cm is partly filled with water.A solid metal sphere of radius 3cm is lowered into the water by means of a thin wire until it is totally immersed. Find the increase in (i) the depth (ii) the pressure at a point on the base (iii) the thrust on...
Back
Top