Q. 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 wave length of electron
A) Increasing, increasing
B) Increasing, decreasing
C) Decreasing, same
D) Same, Same
Explanation
(c) $\lambda = \frac{h}{mv}.$ Since $v$ is increasing in case (i), but it is not changing in case (ii) hence, in the first case de-Broglie wavelength will change, but it second case, it remain the same
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.