21. Which of the following has the highest energy per photon? (A) infrared, (B)blue light, (C)green light, (D)orange light, (E)red light

1. A beam of light with an intensity of 15 W is. incident on a copper plate (work function is7.43xl0-19 J). Electrons with a minimum wavelength of 3.75x10 －10 m are ejected from the surface of the copper. Calculate the frequency of the incident light. [Hint: Plank constant = 6.626 x 10－34J·s] (A)3.7lx1015Hz (B) 3.71 x 1016 Hz,(C) 3.71 x 1017 Hz,(D) 3.71 x 1018Hz(E) none of above

21. Which of the following has the highest energy per photon?
(A) infrared,
(B)blue light,
(C)green light,
(D)orange light,
(E)red light

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