1-1. Think about what happens when two waves interact. Do you end up with a larg
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Question
1-1. Think about what happens when two waves interact. Do you end up with a larger amplitude wave, a smaller amplitude wave, or even no wave?
1-2 What conditions do you need to make a larger amplitude waver?
1-3 What would show that light has wave properties?
2-1 You have a glass-covered slit film with different slit patterns with a range of slit widths, spacing, and number of slits. The details of the slits on the selit film are below the question. View the straight filament lamp moounted at the front of the room through the slits. What happens as you change slit number, slit spacing and slit width?
2-2. Why don't you see the same effects when you look through a doorway?
3. What happens when a laser goes through the diffraction grating? Explain.
4-1. Use a helium-neon laser ( wavelength = 632.8 nm) and the double slits to demonstrate that light has wave properties. What happens as you change slit separation? ( initial a=0.095 mm, initial s= 69 cm, 1st order of y =1 cm, 2nd order of y = 1.5 cm)
4-2 What happens as you change the distance to the screen? Be quantitive.
5. Figure out, using geometrical arguments, where you should see bight spots and where you should see dark spots. Does this agree with what you observe?
6. Would the same concepts hold for sound wavers? For water weave in the turtle pond?
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Explanation / Answer
1.1 when two waves interfere, the resusltant amplitude of the wave could be larger or smaller, dependnig on they combine.
1.2, if crest of one wave falls on the crests of another wave or (trough - trough) interface gives larger amplitude
this is called cinstructuve interference
condition fro this is path difference (Y2-Y1) = mL
intregral values of wavelength(L)
if crest falls on trough or vice versa, that leads to the formation of smaller amplitude
condition is y2-y1 = (m+0.5) L
1.3 the formation of fringes on the screen eithrer due to single slit or double slit are the evidences thatn show light have wave nature
2.1 Y = mLR/d
where m is the order
L = waveelngth
R = distance between the screen and and ther slit
Y is the distance of brigth or dark spot from the central spot.
slit width d and fringe width Y are inversly prop , so changes takes place accordingly
2.2. wavelength is on the order of diffraction grating spacing (doorway size), you will start to notice diffraction effects. In practice, you clearly do not notice diffraction effects when you walk through the doorway since you cannot move that slowly.
3. The slowing down of the radiation will cause the wavelength to reduce. Shorter wavelength will mean that the diffracted rays will reach full wavelength
( constructive interference ) path differences in a smaller angle of diffraction. The bright spots will move closer together and there will be more of them ( higher orders become possible ) at the outside edge of the diffraction pattern.
4.1 as slit separation is increased,the intensity of fringes reduces and vice versa
4.2 if distance R is incrases intensity of the fringes or spots reduces and uf R is very large, visualisation of fringes is difficult
5..the line joining of all thye nodal points gives rise dark spots and line joining of antinodal points vorresponds to brigth spots
6. not applicable for sound waves and applicable for water waves
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