An electron is moving with an initial velocity \( \mathrm{P} \) \( ...

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An electron is moving with an initial velocity
\( \mathrm{P} \)
\( \vec{v}=v_{0} \hat{i} \) and is in a magnetic field \( \vec{B}=B_{0} \hat{j} \). Then, it's
W
de-Broglie wavelength:
(1) remains constant
(2) increases with time
(3) decreases with time
(4) increases and decreases periodically
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