27. Gamma-rays cause radiation damage when they interact with matter by producing (A) ions and free radicals, (B) isotopes, (C) daughter products,(D)oxidation, (E) reduction.

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

27. Gamma-rays cause radiation damage when they interact with matter by producing
(A) ions and free radicals,
(B) isotopes,
(C) daughter products,
(D)oxidation,
(E) reduction.

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