A) accelerating voltage in electron gun is increased
B) accelerating voltage is decreased
C) distance between the screen and the. slits is increased
D) distance between the slits is decreased
Correct Answer: A
Solution :
: Fringe width\[\beta =\frac{D\lambda }{d}\] For lower magnitude of\[\beta ,\lambda \]should be low. Energy of electron when accelerated \[=eV=\frac{hc}{\lambda }\] Or \[\lambda =\frac{hc}{eV}\] Or\[\lambda \]will be low if accelerating voltage\[V\]is high. \[\therefore \]Accelerating voltage in electron gun should be increased for lower \[\lambda \]and lower\[\beta \].
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