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Assertion :- In Davisson - Germer experiment wavelength associated with beam decreases with
\( \mathrm{P} \) increase in speed of electrons.

W
Reason :- Wavelength associated with electron
- beam in Davisson - Germer experiment is given
\( - \) by \( \lambda=\frac{\mathrm{h}}{\sqrt{2 \mathrm{mE}_{\mathrm{k}}}} \)
- (1) \( \mathrm{A} \quad \) (2) \( \mathrm{B} \)
(3) \( \mathrm{C} \)
(4) D
- (A) Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.
(B) Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion.
_ (C) Assertion is correct, but reason is wrong statement.
(D) Assertion is wrong, but reason is correct statement.
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