Imagine a photon strikes a metal plate that has a work function of 3 x 10 - 19( 3 x 10 raised to power -19) J. If the photon has an energy of 3.4 x 10 -18( 3.4 x 10 raised to power-18) J, what is the maximum kinetic energy of the ejected electrons?
A) 3.1 x 10-18 J B) 3.1 x 10-19 J C) 31 x 10-18 J D)0.31 x 10-18 J
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Answer:
A
Explanation:
KE=energy of photon +workfn
=(34-3)×10^-19
=3.1×10^-18
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