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Electrons are ejected from a metallic surface with speeds ranging up to 2.00 x 10 m/s when
light with frequency of 4.00 x 1020 Hz.
Find the cutoff frequency for this surface in units of 1020 Hz.
(B) 4.78
(C) 6.51
(A) 2.45
(D) 3.58
(E) 5.49

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