1. The bright fringes we see in the interference pattern are locations where lig
ID: 1502532 • Letter: 1
Question
1. The bright fringes we see in the interference pattern are locations where light waves (select one) Constructively/destructively interfere.
2. the interference equation predicts that the displacement of a fringe on the screen is greater for longer wavelengths. which color will be displaced more, red or blue?
3. If it is true that two light waves are present at the location of a dark fringe but are simply half a wavelength out of phase, where is the energy of the waves?
4. A double slit interference pattern uses red light with wavelength= 650 nm. The slits are 1 apart. What is the angle for the first order bright fringe?
5. A grating is to be used to determine the wavelength of red laser light. What information do you need to know and measure to get the result?
Explanation / Answer
1. Constructive Interference
When two or more waves come together, they will interfere with each other. This interference may be constructive or destructive. If you take two waves and bring them together, they will add wherever a peak from one matches a peak from the other. That's constructive interference
2. Since the Red color has longer wavelenght than blue, hence red color will be displaced more
3. When the light is half-a-wavelength out of phase with the light from the end, resulting in destructive interference and less light at the detector.
Energy goes into generating the nonpropagating excitation and some transient waves that propagate away after a short period of time. When the transients are gone, however, no more energy is added to the system.
4. For the first order bright fringe
sin(theta) = m*lambda / d
m = 1
d = 1 mm = 10^-3 m
sin(theta) = 6.5*10^-5
theta = 0.038 degree
5. To measure the wavelenght you will need to know the distance between the slit.
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