Teaching Haryana (HPSC) Assistant Professor Mock Test 2025 Physics Atoms De Broglie’s Explanation of Bohr’s Second Postulate of Quantisation
An electron (mass m) with an initial velocity
\(\vec{v}=v_0 \hat{i}\left(v_0>0\right)\)
is moving in an electric field
\(\vec{E}=E_0 \hat{i}\left(E_0>0\right)\)
where E0 is constant. If at t = 0 de Broglie wavelength is
\(\lambda_0=\frac{h}{m v_0}\)
, then its de Broglie wavelength after time t is given by
1
λ0
2
\(\lambda_0\left(1+\frac{e E_0 t}{m v_0}\right)\)
3
λ0t
4
\(\frac{\lambda_0}{\left(1+\frac{e E_0 t}{m v_0}\right)}\)
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