Q.

The mass of an electron in motion depends upon -

A. Direction of motion
B. B its velocity
C. C its velocity of e-
D. D it’s shell number
Answer» B. B its velocity
Explanation: The electron has a mass that is approximately 1/1836 that of the proton. Quantum mechanical properties of the electron include an intrinsic angular momentum (spin) of a half-integer value, expressed in units of the reduced Planck constant, ħ.
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