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MHT CET 2026 (15 May, Shift 1) · Matter Waves: de Broglie Wavelength

Matter Waves: de Broglie Wavelength question from MHT CET 2026 (15 May, Shift 1)

Q26MHT CET 2026 · 15 MAY · SHIFT 1Difficult

Matter Waves: de Broglie Wavelength

An electron of mass $m$ and charge $e$ initially at rest gets accelerated by a constant electric field $E$ . The rate of change of de-Broglie wavelength of the electron at time $t$ is

( $h$ = Planck's constant)

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Answer: (a)

From rest: $p = eEt$ , so $\lambda = \dfrac{h}{eEt}$ .
$\dfrac{d\lambda}{dt} = -\dfrac{h}{eEt^2}$
So the answer is (a).

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