Coherent electron beam is being used in YDSE. On increasing accelerating voltage, fringe width will

decrease

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remain unchanged

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increase

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may increase or decrease

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Solution

The correct option is A decrease
$λ = \frac{h}{p} = \frac{h}{\sqrt{2 m k}} = \frac{h}{\sqrt{2 m e V}}$
So when Voltage $↑$ , $λ$ $↓$ .
Since fringe width $B = \frac{D λ}{d}$
hence B $↓$ .

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