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Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsDual Nature of Radiation and Matter2 Marks
Question
If the potential difference used to accelerate electrons is tripled, by what factor does de Broglie wavelength of electrons beam change?
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Answer

de Broglie wavelength of electrons accelerated through a potential difference of V volts is $\lambda=\frac{\text{h}}{\sqrt{2\text{meV}}}$
When accelerating voltage V is tripled, the de Broglie wavelength becomes $\frac{1}{\sqrt{3}}$ times.

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