According to Einstein, as the wavelength of the incident monochromatic light beam becomes shorter, the work function of a target material in a phototube:
a. increases.
b. is directly proportional to wavelength.
c. decreases.
d. remains constant.
D
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Suppose you photographed Earth's dark side from space, using ultraviolet-sensitive film, and using infrared-sensitive film. What would you expect to see in the photo?
A) Both photos would show radiation coming from all over Earth. B) The ultraviolet photo would show only artificial sources such as streetlights, while the infrared photo would show radiation coming from all over Earth. C) Neither photo would show anything--they would both be completely dark. D) Both photos would show only artificial sources, such as streetlights. E) The ultraviolet photo would show radiation coming from all over Earth, while the infrared photo would show only artificial sources such as streetlights.
Which has the greater density, a lake full of water or a cupful of lake water?
A) the cupful of lake water B) the lake C) both have the same density