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  • Consider Fig. 11.7 in the NCERT textbook of physics for Class XII. Suppose the voltage applied to A is increased. The diffracted beam will have the maximum at a value of θ that(a) will be larger than the earlier value(b) will be the same as

Consider Fig. 11.7 in the NCERT textbook of physics for Class XII. Suppose the voltage applied to A is increased. The diffracted beam will have the maximum at a value of θ 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

Answers (1)

The answer is the option (c)
The de-Broglie wavelength of diffracted beam of electrons is given by 

\lambda_{d}=\frac{12.27}{\sqrt{V}}A^{\circ}..............(i)

   If there is a maxima of the diffracted electrons at an angle \theta, then 2d \sin \theta =\lambda

 From equation (i), we get that on increasing the voltage, \lambda_{d} decreases which in turn

 decreases the value of \theta

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