Passage VI

Light causes some metals to eject electrons. The energy of those electrons, in joules (J), depends on the light frequency and the kind of metal. Figure 1 shows how the maximum energy of ejected electrons varies with frequency, in hertz (Hz), for 5 metals. Figure 2 shows how the number of electrons emitted by a metal varies with the intensity of light at a constant frequency. Figure 3 shows the maximum energy an ejected electron can have for a given intensity of light at a constant frequency.

31. The hypothesis that turning on more light will increase the number of electrons emitted per second is supported by which figure(s)?

(Note: Assume the additional light also has adequate energy to eject electrons from metals.)

Answer and Explanation

Your Answer is

Correct Answer is B

Explanation

The ordinate of figure 2 is the number of photoelectrons, and the intensity of light on the abscissa corresponds to the amount of light in the title. When the intensity increases, more photoelectrons are excited, which supports the hypothesis of the title