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Consider figure. Suppose the voltage app...

Consider figure. Suppose the voltage applied to A is increased. The diffracted beam will have the maximum at a value of `theta` that

A

will be larger than the earlier value

B

will be the same as the earlier value

C

will be less than the earlier value

D

will depend on the target

Text Solution

Verified by Experts

In Davisson-Germer experiment the de-Broglie wavelength associated with electron is
`" "lamda=(12.27)/(sqrtV)Å`
where V is the applied valtage.
If there is a maxima of the diffracted electrons at an angle `theta,` then
`" "2dsintheta=lamda`
From Eq. (i). we note that if V is inversely proportional to the wavelength `lamda.` i.e., V will increase with the decrease in the `lamda.`
From eq. (ii), we note that wavelength `lamda` is directly proportional to `sintheta` and hence `theta.` So, with the decrease in `lamda,theta` will also decreases.
Thus, when the voltage applied to A is increased. The diffracted beam will have the maximum at a value of `theta` that will be less than the earlier value.
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