In a Young's double-slit experiment,interfere | vedclass

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(B) The fringe width $\beta$ in a double-slit experiment is given by $\beta = \frac{\lambda D}{d}$.According to the de Broglie hypothesis,the waveleng

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Decrease the electron gun voltage.

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(B) The fringe width $\beta$ in a double-slit experiment is given by $\beta = \frac{\lambda D}{d}$.According to the de Broglie hypothesis,the wavelength of an electron accelerated through a potential $V$ is $\lambda = \frac{h}{p} = \frac{h}{\sqrt{2mqV}}$.Substituting this into the fringe width formula,we get $\beta = \frac{hD}{d\sqrt{2mqV}}$.From this expression,it is clear that $\beta \propto \frac{1}{\sqrt{V}}$.Therefore,to increase the fringe width $\beta$,the accelerating voltage $V$ must be decreased.

In a Young's double-slit experiment,interference is obtained using electron waves. The electrons are produced by an electron gun. To increase the fringe width,one must:

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