First slide

Matter waves (DC Broglie waves)

Question

In Davission experiment, if applied accelerating voltage is increased. The diffracted electron beam will have the maximum at a value of $θ$ that

Moderate

A

will be larger than the earlier value
B

wll be the same as earlier value
C

will be less than the earlier value
D

will depend on target

Solution

$λ = \frac{12.27}{\sqrt{V}} A^{0}$ , …….(1)
Also $2 d \sin θ = n λ$ ……..(2)
When potential V is increased, $λ$ decreased (from 1)
As $λ$ decreases, $θ$ will be less than the earlier value (from 2)

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