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QUESTION

A photon of wavelength 200 nm strikes the surface of a metal causing an electron to be ejected with kinetic energy of 4.3x10^-19 J. What was the

A photon of wavelength 200 nm strikes the surface of a metal causing an electron to be ejected with kinetic energy of 4.3x10^-19 J. What was the threshold frequency of the metal?

a) 8.5 x10^14 Hz

b) 1.6 x10^12 Hz

c) 5.2 x10^15 Hz

d) 1.2 x10^13 Hz

e) 7.4 x10^15 Hz

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