Home Physics Electron, Photon, Photoelectric Effect and X-rays Hard An electron is moving through a field. It is…
Physics Electron, Photon, Photoelectric Effect and X-rays Hard MCQ (Single Correct)

An electron is moving through a field. It is moving (i) opposite an electric field (ii) perpendicular to a magnetic field as shown. For each situation the de-Broglie wavelength of electron

A
Increasing, increasing
B
Increasing, decreasing
C
Decreasing, same
D
Same, Same

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The correct answer is:
C

. Since is increasing in case (i), but it is not changing in case (ii). Hence, in the first case deBroglie wavelength will change, but it second case, it remain the same

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