Pulse Definition and 323 Threads

A steel wire of length 5.0m and radius 0.300 mm is knotted to another steel wire of length 5.0m and radius 0.10 mm. The ires are strethed with a tension of 150 N. How long does a transverse wave pulse take to travel the distance of 10 m from the beginning of the first wire to the end of the...

I am new to the field of relativity. I read the Lorentz transformation between different system of coordinates. I have a question. Let's suppose that we have a Doppler shifted pulse in frequency (time dilation). This pulse has the same amplitude as the pulse seen by a moving observer. That is...

(Offtopic from another thread) So I have a super-duper laser which can emit a very short but extremely powerful pulse in some direction. This pulse is so powerful that the energy of light is say 1Kg * c**2, or the relativistic mass of light is 1Kg. What is a gravity from that light...

I am currently working a project to evaluate the power output of a single pulse through an air core transformer. Using a scope to measure the secondary output and I am confused on what voltage to use. Scope shows DC voltage, peak voltage, drop Voltage differntial of peak and drop voltage. Would...

Detailed ideas on how different wavelengths and pulse durations can limit scans

Homework Statement The figure shows two masses hanging from a steel wire. The mass of the wire is 60.0 g. A wave pulse travels along the wire from point 1 to point 2 in 24.0 ms. What is mass m? Homework Equations The Attempt at a Solution L=8.0m m_{string}=60g=0.06kg...

Homework Statement a pulse 1 m long contains 1000 α particles.at t=0,each α particles in the state ψ(x,0){1/10e^(-ik_0 ) lxl≤50cm,k_0=π/50 and 0 for elsewhere,} at t=0 ,how many particle s have momentume in the interval 0<hk<hk_0? Homework Equations introduction to quantum...

Is it possible to detonate or to ignite a fuel and air mixture using lasers, or a laser pulse, any type of laser, CO2 or other wise ? or is there any possible way of using Lasers for the propulsion of an aircraft, i am already aware of several methods, but they do not include ignite fuel, any...

Greetings I've been reading about these magnets such as these: http://www.lanl.gov/orgs/mpa/nhmfl/magnets.shtml Take a look at the pulse durations (it says in notes at the bottom "Total pulse length including decay" It's all nice but I don't understand one thing. How can they make...

I also posted this under Computer Science incorrectly... I am curious if anybody knows how to build an Electromagnetic Pulse Generator (aka EMP). I've looked for a guide online, but all of the ones I've seen are far too advanced and/or powerful for my purposes. I'm looking for about a 5'...

Hi There, A square pulse of light has the form f(x) = A exp(ik0x) for |x| < L/2 and f(x) = 0 everywhere else. I want to know how that pulse evolves overtime. I want to graph it in Mathematica. I did a Fourier transform to find the wave number spectrum, with the general form: F(k) =...

wat is meant by the clock pulse given to the flip flops in digital circuits. Is it just a supply that is given to the ic as long as it is held in on position. How do some chips operate when the clock goes from high to low and not when pulses go from low to high?.

Take a laser source with small bandwidth centered around the average frequency (or wavelength) With an hypothetical external modulator that can switch as fast as we want, ca we make a pulse that is spatially shorter than 1 wavelength? If not? Why? What would that entail? Clearly the number...

Heres the graph... http://img205.imageshack.us/img205/4770/graphfc6.jpg" Im trying to find the Average value for a pulse waveform... the formula is Vavg = baseline + (duty cycle) (amplitude) How do I treat the amplitude since it varies...Do I treat the cuty cycle differently as...

Homework Statement I need help finding the exponential Fourier series for the pulse train below. http://img329.imageshack.us/img329/1184/20080427091409ev5.jpg Homework Equations p_T(t)=\sum_{n=-\infty}^{\infty}{D_n e^{j2nt} D_n=\frac{1}{T_0}\int_{T_0}^{}{x(t)e^{-j2nt}dt}The Attempt at a...

A current pulse exists, in which the current jumps from 0A to 10A, stays at 10A for 200 microseconds, then drops from 10A to 0A. What makes a current pulse different from the current that runs when a switch in a DC circuit is left closed for 200 microseconds...is it the same concept?

I'm trying to optimize pulse coils and determine power consumption. According to Ohm's law: P = V2/R where P=power / V=voltage / R=resistance Why isn't Ohm's law providing the same results as actual meter testing?? Testing coils with 1 "C" battery: 1.5 volts #1) 2.3 ohm coil...

I am trying to measure very high light pulses by using photodiodes. Light levels are expected to be upwards of 2-3W of irradiance. Pulse-widths are from 20uSec to 1mSec. Example light source is a highly over-driven high brightness LED, typically 200-300mW in power (during recommended current...

i'm having a LOT of trouble understanding pulse train response in RL and CR circuits... could someone please recommend a good reading over the internet... i understand LR and RC response fairly better... and use the snapshot idea to get voltage equations etc... but its very confusing and i...

Hey, I need to find a way to convert a pulse that can be in any amplitude from 0 to 5v and output DC voltage at the same amplitude. any ideas? :) Liad.

Homework Statement Multipath dispersion of a pulse of light in an optical fiber. How is this problem solved?

Homework Statement a cord of mass 0.65 Kg is stretched between two supports 28 m apart, The tension of the cord is 150 N, how long will it take a pulse to go from one end to the other? Homework Equations ok, so I really know is: speed of wave=frequency*wavelength... The Attempt at a...

How to "pulse" electric a current I'm looking for a way, or component, that will pulse an electrical current through a circuit, and I'm not sure where to start looking. I'm looking to hook a 9v battery to a small simple circuit and send the current through that circuit in pulses. For example...

Suppose I am in an inertial non-accelerated reference frame, and I observe a laser pen moving in a direction perpendicular to its length at a uniform constant velocity of one meter per second. If the laser pen were to fire very briefly, say for 1 millisecond, while in this state of uniform...

Hi there I'm looking for anyone who has the knowledge or experience that can help me develop a pulse induction gold metal detector. I have the fabrication resources but need someone who understand metal detection/circuit board technology. Please Email with experience.

Hallo to all, I have been reading a paper regarding electric pulse attenuation and the values are quoted in dB. The conversion to dB was done by multiplying the value with (20log10e) where "e" is the base of the natural logarithm. I see this conversion to dB fist time. I can not find any...

Homework Statement Two springs are connected, one is a heavy spring and the other is a light spring. A pulse is traveling down spring A, towards a junction with spring B. Which of the following statements are correct/incorrect. A. If spring A is the heavy spring then the transmitted pulse...

Hello, I am having trouble finding solutions for a localized electromagnetic pulse in 3-D. Ideally, I'd like the fields to be zero outside of a region centered on the pulse, but a gaussian wavepacket is fine with me as well. Let's have the pulse travel in the z direction, the plane wave...

A laser pulse has a duration of 50 fs (50E-15 s) and an energy of 1 mJ. The laser is focused to an area of 50 micrometers square. What is the peak intensity and peak electric field at the focus? I previously tried to do this problem with normal intensity equations using intensity =...

Train problem Homework Statement 005 (part 1 of 1) 10 points A 23-car train standing on the siding is started in motion by the train's engine. There are 4 cm of slack between cars. The cars are 9 m long. The engine is tightly connected to the first car and moves at a constant speed of...

Hello All, I'm looking for a nifty chip that I can use to pro grammatically set the pulse width of a square wave signal in my circuit. The pulse width range I'm looking for is anywhere between 10 ns and 500 ns and so far, the only thing I have found is the DS1014 series ICs. They have the...

Hi everyone:smile:, This is my question: " Describe the concepts of PCM (Pulse Code Modulation) in a computer keyboard which its data are in digital format." This is my justification: How to describe the concepts of PCM ? Isn't PCM a technique used to transmit analog signals in digital...

I am a student in a DMS program. Our instructor poised the following question (worth extra credit!) if we can answer it and back it up. OPERATING FREQUENCY IN PULSED WAVE TRANSDUCERS IS DETERMINED BY: A. FREQUENCY OF THE VOLTAGE B. PULSE REPITITION FREQUENCY C. THE MEDIUM ONLY D. THE THICKNESS...

Hello All, I have been doing some experiments where I need to make a very short pulse to switch on and off a MOSFET I am using (IRF840) but all I have as a pulse source is a small function generator which outputs square waves fixed at 50% duty cycle. So I had an idea to use a simple high...

i was reading about pulse jets and ram jets as part of my course on jet propulsion. all i was told was that they are aero-thermo-dynamic-ducts. couldn't understand what they mean. checked google, but the articles i got were vague. could someone explain what aero-thermo-dynamic-ducts are?

Homework Statement 2. The attempt at a solution i thought it was number one...as we have -4.5m/s in the equation indicating that the pulse is moving in the negative direction.. i submitted the answer.unfortunately it was incorrect.. Can you help me with this..if possible.

Homework Statement Submarine is traveling at 12 m/s toward an aircraft carrier emits a 2400 Hz sonar pulse. The reflected pulse returns with a frequency 2310 Hz. What is the speed of the aircraft carrier? (Positive/negative means the carrier is moving toward/away from the submarine.) The...

Hi, I have this problem to do for HW. I did what it asked for, or so I think. I think I may have made a mistake somewhere, it's telling me its not correct. Can you check it out? BTW, I have to use the step by step approach. I'm assuming my solution will be v(t) = K1 + K2 * e^(-t/RC). I then...

consider a pulse traveling down a stretched rope. what makes the pulse to travel in a particular direction (let say to the right) and not the other?

Hello I currerntly have this circuit - https://www.physicsforums.com/attachment.php?attachmentid=8419&stc=1&d=1164497449 circuit1.jpg I am trying to keep it as simple as possible. I have scoured loads of site etc, an have even found the circuit I want, or should I say it is described as the...

Question Details: The figure shows two rectangular wave pulses traveling toward each other on a stretched string. Each pulse is traveling with a speed of 1.00 mm/s, and has the height and width shown in the figure. If the leading edges of the pulses are 8.00 mm apart at t = 0, sketch the shape...

I was reading about what would happen if an Anti-Matter star and Matter star collided. What I read says the collision would make enough gamma rays to sterilize and entire eighth of a galaxy of life. Yet, I thought about something, when the two collide, their surfaces would touch first. (Duh) So...

Here is the problem: If a pebbel is tossed into a pond, a circular wave pulse propagates outward from the disturbance. If you look closely you will see a fine structure in the pulse consisting of surface ripples moving inward though the circular disturbance. Explain this effect in terms of...

This is not homework please do not move it to the homework section. I need a pulse generator for an experiment I want to conduct at home... but I don't have that kind of money so I am trying to design and build one. I am trying to see if the type of pulse generator I need is even feasible...

Hi, Im trying to calculate the power of a pulse. I know the duration of the pulse t in seconds and I know the peak current Ipeak in Amps. If need be I can also calculate the resistance R of the conductor. I know of P=RI^2 but am not sure if this holds for pulses. Help/Tips/Suggestions...

Finally, after several delays on the DVD, PULSE has ust come out on DVD...A few days Ago I went to get it, tonight I got around to watching it...but the first disk is more scratched that anything I've ever seen, and disk 2 has some pretty bad scratches aswell...so now I have 2 DVDs that don't...

Hi, I need some help/ideas/direction... I need to build a pulse generator that is capable of generating a peak current between 100A~1000A that lasts for about 0.5ns and can be ready to pulse again in 0.5ns so the frequency of operation is around 1Ghz Help! Thanks

Instead of shooting a single burst of beam, use multiple shots ( say 1000 per second or more ) Theoritically each laser beams should punch a hole through the air, each one traveling further and each one creating a vacuum within its path. The high powered lasers that auto industries use have...

Sir, 1)Is it true that y = a sin(wt) is the equation of a wave pulse and y = a sin(wt – kx) is the equation of a progressive wave? I think it is true. 2)Will the following 2 waves produce stationary waves? y1 = a cos(kx – wt) y2 = a sin(kx + wt) I think the answer is No. What do...

I was debating on another forum about EM Pulse (yes, I just watched War of the World :-p ). Anyway, does anyone know exactly what electrical components will be damaged by an EMP? I know silicon chips would be dead, but what about capactors, diodes, resistors, etc. Also, if a cars...