Question

Jojo

求解

/A beamoflight with an intensity of 15W is incident ona copper plate
-(work ftrniction is 7.43 x 10.19)D). Electrons with aminimum wavelength 0f
3.75x 10、" m are ejected from the surface ofthe copper. Calculate the
frequency ofthe incident light. [Hint : Plank constant 三6.626 x 1034J.s]
.。(A) 3.71x 101? Hz,    (B) 3.71x 101“ Hz,    (C) 3.71x 10U Hz,
(D) 3.71x 1018 Hz,         (E) none ofabove.                     【100 台聯大(AI,A5)】
Ans.: (A)