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Q.

Imagine a Young's double slit interference experiment performed with waves associated with fast moving electrons produced from an electron gun. The distance between successive maxima will decrease if:

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a

the accelerating voltage in the electron gun is decreased

b

the accelerating voltage is increased and the distance of the screen from the slits is decreased

c

the distance of the screen from the slits is increased

d

the distance between the slits is decreased

answer is B.

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Detailed Solution

Fringe width β=DλdHere λ=de-Broglie wavelength of electron=hmv=h2mK=h2mqVHere V= potential differenceSo, β∝Dd β∝λ∝1VNow option can be checked for correct result.β(↓)⟶V(↑) D(↓) d↑   λ↓
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Imagine a Young's double slit interference experiment performed with waves associated with fast moving electrons produced from an electron gun. The distance between successive maxima will decrease if: