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.

34. According to the data, which of the following statements best compares the frequencies of light required for both Metals A and D to produce an electron with a maximum electron energy of 2 x 10-19 J ?

Answer and Explanation

Your Answer is

Correct Answer is J

Explanation

Go back to figure1 and find the optical frequencies required by metal A and D when the ordinate is 2, which are 5 and 10 times ten to the fourteenth power respectively, so the frequency required by D is about twice that of A, so choose J.