fore Ephes balances the repulsive (d) In part (c), you should have found a quant

Question

fore Ephes balances the repulsive (d) In part (c), you should have found a quantity that only depends on physical constants. Express your answer from part (c) as a number in meters per second. Does this look familiar? Problem 3: We saw in lecture that light waves can be polarized. Can sound waves be polar- ized? If so, give an example of polarized sound. If not, explain why not. Problem 4: Helium-neon lnsers emit light with a wavelength of 633 nm (633 x 10-7 m). (a) Is this light visible? If so, what color is it? (b) What is the frequency of this light? (c) What is the energy of one photon from this laser? (d) Suppose the power output of a belium-neon laser is 0.005 W. How many photons per second are emitted? Problem 5: Electrons on the surfnce of a metal can be ejected by shining light on them. However, a very bright red light source will not eject electrons, while even a very dim violet light source will eject electrons froms the metal immediately. Why is this? Problem 6 Suppose you perform a double slit experiment with only a few hundred electrons (a) Sketch what the pattern on the far screen would look lake if electrons behaved purely like elassical waves. (b) Sketch what the pattern on the far screen would look like if electrons behaved purely like classical particles. (c) Sketch what the pattern on the far screen actually looks like when this experiment is performed D VISION

Explanation / Answer

5)

we know Energy of photon,

E = h*f or h*c/lamda

h ---> planks constant

f ---> frequency

c --> speed of light

lamda --> wavelength of the light

when energy of photon is greater than work function of the metal electron are ejected.

we know, red light has low frequency than violet light.

so, the energy of red light photons are less than work function

and the energy of violet light photons are greater than work function of the metal.

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