SAT Subject Physics Practice Question 510: Answer and Explanation
11. When a photon strikes an electron and energizes it, the electron will receive the most energy from the photon if
A. the electron does not spin when it is struck.
B. the photon has a high velocity.
C. the photon has a low velocity.
D. the photon has a long wavelength.
E. the photon has a high frequency.
Correct Answer: E
The correct answer is (E). The higher the frequency of a photon, the more energy it has, therefore the more energy it can impart to the electron.