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(B) The momentum $p$ of the electron is given by $p = mv$. When the velocity $v$ increases,the momentum $p$ increases.According to the de Broglie hypo

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Fringe width decreases

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(B) The momentum $p$ of the electron is given by $p = mv$. When the velocity $v$ increases,the momentum $p$ increases.According to the de Broglie hypothesis,the wavelength $\lambda$ is given by $\lambda = h/p$.Since $p$ increases,the wavelength $\lambda$ decreases.The fringe width $\beta$ in a $YDSE$ experiment is given by $\beta = \lambda D/d$,where $D$ is the distance between the screen and the slits,and $d$ is the slit separation.Since $\beta \propto \lambda$,a decrease in wavelength $\lambda$ leads to a decrease in the fringe width $\beta$.

$A$ beam of electrons is used in a $YDSE$ experiment. The slit width is $d$. When the velocity of the electrons is increased,then

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