InterviewSolution
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InterviewSolution
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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 valueB. will be the same as the earlier valueC. will be less than the earlier valueD. will depend on the target |
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Answer» 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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