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

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