Intensity Definition and 898 Threads

According to Raman effect, the intensity is directly proportional to the 4th power of the wavelength. Then how come stokes lines, which have higher wavelengths than anti-stokes lines, are more intense than the anti-stokes lines?

Hi, I just came to this problem when I was studying the photoelectric effect, what is the exact definition for "light intensity" ? Is it just n (the number of photons) or is it E/(A.t) where E=nhf ? The latter can be the same as the former in comparison when we suppose the frequency is the...

but somehow my brain is not working... how does the intensity of radiation emitted by a star (but really any hot sphere, really) vary with distance from teh star? at the surface the intensity is I = 4 \pi \sigma T^4 R_{star}^2 as we move away I = 4 \pi \sigma T^4 (R_{star} + r)^2...

Does the intensity of the electric field between two charged parallel plates stay constant regardless of the distance between the plates, assuming of course that the plate area is such that the plates do not become point charges?

Decibel / Intensity Problem, How do I approach it? ASAP.! I have a question, I don't know how to approach it.. I couldn't find a way.. [FONT="Tahoma"]1.Suppose that the sound level of a conversation is Initially at an angry 70 dB and then drops to a soothing 50 dB. Assuming that the...

The intensity from a multi slit grating with 2N+1 slites is given by: I(Y)=\frac{M^2}{2R^2} \frac{sin^2 \left[(2N+1) \frac{x}{2}\right]}{sin^2 \left[\frac{x}{2}\right]} where x=\frac{2 \pi Y d}{D \lambda} I am to show how to find the limiting case of just two slites and show that in...

the wave intensity is defined as the squared wave amplitude. I(z,t)=A^2 (z,t) A(z,t)=a cos [2 \pi (\frac{r}{\lambda}-\frac{t}{T})] the wavelength is 10cm period is 1/10s a=1mm 1. what is the instantaneous intensity at r=15cm and t=.5s? is the solution: A^2(z,t)=(.1 cos [2 \pi...

Hello. I am totally stuck on this question. I don't even know where to begin. Any help would be appreciated: A spherical sound source is placed at P1 near a reflecting wall and a microphone is located at P2. The frequency of the sound source is variable. Find the two lowest frequencies for...

Sir, A circularly polarised light of intensity I is passed through a polariser resulting in the production of plane polarised light.What is the intensity of the plane polarised light? What is the expression which governs this effect?The formula that I know is I' = I cos^2x(Mallus law).Here...

Any help on this question is appreciated. Two small spheres each of mass m are suspended by light strings of light L. A uniform electric field is applied in the x direction. If the spheres have equal and opposite charges of magnitude Q, determine the electric field intensity that enables the...

I've attached a circuit schematic for the temperaure intensity meter... R1 is the PTC the first 555 works as monostable so it triggers second 555 to produce Astable pulses with given frequency depending on the values(R3 and R3 and C4) anyway i want to ask if i have to supply my second...

In this problem you will use the decibel scale to analyze a small firecracker that emits 1200 W of peak power. How does I(the intensity) relate to 1200 peak power? THANKYOU!

Two speakers produce a 180Hz sound in phase. If an intensity is located 2.10m from the nearer spearker, find the distance to the further speaker if the speed of sound in the air is 345m/s. I don't understand exactly what this problem is asking for, and I can't find an equation relating these...

Hey dudes and dudettes, loving the forum here. Will be around quite a bit for the next year or so hopefully.. Just a quick question, any help would be appreciated so much.. I'm doing my A2 main coursework, that's the one you do when you're 18 for all the American types, and was wondering...

This is the schematic of my project (figure7)...but I don't know how to add display (ICL7107) using eagle, and how to power display .. how to connect the output voltage of stage2(second opamp) to the display? http://www.seas.upenn.edu/~ee205/Labs97S/Lab7/Lab7.html anyway , take a look at...

consider a piston in an engine with a stroke of 86 mm and RPM 8000 which gives the frequency of sound it is producing(due to compression and decompression) to be 133 Hz and wavelength 2.57 m. Then the pressure amplitude turns out to be 20000 Pa and the intensity of the sound wave to be...

I tried reading my textbookfor the answers to these questions, but I can't find an answer. Can someone answer these questions? 1. Changing the magnetic field intensity in a closed loop of wires induces A. Current B Voltage C. Both D. Neither 2. True or False: Energy emitted by...

A person standing a certain distance from an airplane with three equally noisy jet engines is feeling a sound level intensity bordering on pain, 120dB. What sound level would this person experience if the captain shut down one engine? this is what I did: B-120=10log.33 and ended up with...

While I and my friends were talking about some topics in optics, we come to realize that we do not know how to measure the the intensity of light. Does anybody have a good idea? I don't want to hear 'Oh, You use blah blah to measure the Intensity of light' but rather what's being directly...

Suppose that you are an observer in a room equipped with only one window measuring 1 m sq. The window is glazed with a glass pane 1 cm. Thick. The only source of illumination is a green surface outside the window. Hence the only light entering the room is the green light from this surface...

If a large housefly 3 m away from you makes a noise of 40 dB, what is the noise level of 1000 flies at that distance, assuming interference has a negligible effect? Noise level of 1000 flies = ?

Hi all, I need a hand regarding this problem, just can't seem to find the start point. (It's a two parter): What is the specific intensity of the radiation at the solar surface in the direction of Earth What is the specific intensity of solar radiation at the surface of the Earth. As...

This is for an assignment that is due next Monday for me. I'm kind of confused here for how to calculate the magnetic field intensity at all points for the conductor(s) in the diagram I have attached. First, there is a cylindrical conductor of radius a, then surrounding it is another conductor...

affect the infiltration of water in the soil? :bugeye: Thank you thank you thank you.. :]

Hey everyone! What is really the difference between flux and intensity in astronomy? What I understand they are two different words of the same thing, namely energy per square length unit per time unit. I appreciate any help, thanks alot!

If monochromatic light of the same amplitude is shown on a closed hollow black box and a closed black box filled with iron, will there be a difference in the intensity of light that is reflected back due to differences in the absorption of light in the two boxes?

Hi, I would appreciate is someone could help me figure out this problem: The electric Field Intensity in free space from a very long, uniformly charged cylinder of radius 5cm is 100 kV/m at a radius of 1m. What must be the surface charge density on the cylinder? I've tried using different...

Hello, I wondered how one treats the double slit experiment quantum mechanically, that is, using probability amplitudes,wave functions,etc...to calculate the intensity on the screen. If anyone knows a link or a paper or a book where I can find it, that'd be nice. -Edgardo

A uniformly charged wire with a charge density of p (rho) extends along the z-axis from z = 0 to z =+ infinity. Determine the electric field intensity at a point P (rho, phi, 0) Ok so I wrote down the equation for electric field intensity for a uniformly charged wire ie E=k[integral of...

I am confused about a homework problem and was hoping that maybe somebody here can help... Homework Problem When a helicopter is hovering 1090 m directly overhead, an observer on the ground measures a sound intensity I. Assume that sound is radiated uniformly from the helicopter and that...

[FONT=Arial Black]A recording engineer works in a soundproofed room that is 43.5 dB quieter than the outside. If the sound intensity in the room is 1.00 10-10 W/m2, what is the intensity outside? Here is how I THINK I should be solving this problem. Intensity level = 10dB * log ( I /...

:confused: A loudspeaker supported well above the ground on a post is supplied with 8.5 W of electrical power. The speaker is able to convert 5.6% of that into sound power. (That number is known as the speaker's efficiency.) If we assume that sound radiates equally in all directions...

I'm given two things: frequency, f = 313 Hz intensity, I = 1.13 uW/m^2 (microWatts per square meter) I'm supposed to find the amplitude of the air vibrations caused by this sound. As always, a push in the right direction is greatly appreciated.

This is the SI unit for luminous intensity. The definition relates to blackbody radiation emitted at a certain temperature for a certain material (so I guess it ISN'T blackbody!), platinum, I think. Except... I don't understand the necessity for the introduction of this unit. Isn't...

Could someone explain to me the mathematical differences between impulse, intensity, and inertia? I mean, they all start with I's, but I still cannot determine any mathematical precision instead variation among these three.

Hello everyone! I'm having a real tough time with this one, maybe I can get a little help. A small helium neon laser emits red visible light with a power of 3.2 mW in a beam that has a diameter of 2.5mm. What is the intensity of the laser beam? Does this intensity obey the inverse square...

sound intensity level can be measured in dB & dB (A). What is the difference between the 2 scales?

Hello guys! I just need a tip. I wish to derive the intensity for a three-slit grating, and got stuck pretty close to the right answer. I've got a snapshot of my work at www.mypost.kit.net THANKS!

I have no idea what I'm doing wrong on this one. I'm having problems somewhere in the log conversions to W/m^2 I believe. A siren mounted on the top of towers produces a noise of 120 dB at a distance of 2 meters. Treating the siren as a point particle (and ignoreing reflection and...

The upper limit of the intensity level of sound waves is about 194 dB. This intensity corresponds to 100% modulation of the air; that is, the amplitude of the pressure oscillations corresponds to that of atmospheric pressure. What intensity (W/m^2) would be required to generate this level of...

If 2 flutist play their instruments together at the same intensity, is the sound twice as loud as that either flutist playing alone at that intensity? Why or why not?

I have a few pretty simple questions that I can't seem to find a clear answer to on the net... The energy of a light wave is directly proportionate to frequency and inversely proportionate to wavelength. This is due to the energy of a Photon being equal to hf. "f" is a constant, so the...

The problem states: A microphone in the ocean is sensitive to sounds emitted by popoises. To produce a usable signal , sound waves striking the microphone must have an intesity of 10.6 dB. If porpoises emit sound waves with a power of 0.0502 W, how far can a porpoise be from the microphone and...

having problems trying to understand and derive the equation for intensity in the double-slit interference pattern. any sort of help would be welcomed. thanks

Quick Physics Help... X and Z represent point charges of -2.4 x 10^-3 C and +3.3 x 10^-2 C respectively. Calculate the magnitude and direction of the electric field intensity at point Y, 5.00 cm from X and 8.50 cm from Z (they all live in a line). Can sumone help me?

How would you calculate the intensity using relative amplitude. Say for a violin...how would you calculate it's intensity for one of it's harmonics or overtones.

Hello Forum members I need help on a homework problem that I am unable to solve. the problem is as follows Given the radius of a star of 9.0 * 10^3 m and surface temperature of 10000 k (blackbody)find the intensity of radiation (watts/m^2) incident on a planet that is located 2.4 * 10^11...

A Radioactive source produces an intensity of radiation of 6000 Bq/M^2 at a distance of 5 meters from a source. Determine the intensity of the radiation at a distance of a)10 metres * Well i think it will be 3000 Bq/m^2 since it is further distance and is halved, can someone verify? b)...