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

Question

Philoid · Accepted Answer

If V is the voltage applied to A and is the wavelength of the beam,

Also, for electrons diffracted at an angle ,

2dsin =

Hence, if V increases decreases and a result decreases.