An electron in a metal suffers collision and if the probability of it being scat

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Question
An electron in a metal suffers collision and if the probability of it being scattered over an angle d? is 2p P(?) sin ? d? where P(?) is an arbitrary function of scattering angle ?, then
Options
A. 2pP(?) sin ? d? = 0
B. 2pP(?) sin ? d? = 2
C. 2pP(?) sin ? d? = -1
D. 2pP(?) sin ? d? = 1

Correct Answer

2pP(?) sin ? d? = -1

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