Question

1) The formula for kinetic energy, K = 1⁄ (2) mv ^ 2 is:
a. It is the correct formula if v is properly interpreted
b. It will always be a higher value
c. At low speeds it is a good approximation
d. At high speeds it is the right formula.

2) A surface emits photoelectrons only when light illuminates it and it exceeds a certain value of:

a. frequency

b. Wavelength

c. intensity

d. speed

3) When light is directed at a surface of a metal, the kinetic energy of the photoelectrons:

a .. It varies with the intensity of the light

b. Varies with the frequency of light

c. It varies with the speed of light

d. Its value is random

Answer 1

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