Question

The mass of the electron varies with.

• A. The size of the cathode ray tube
• B. The variation of ‘g’
• C. Velocity
• D. Size of the electron

Answer 1

Answer: (C)

Velocity

Answer 2

Mass is basically a constant term for any physical application at low velocity. But in accordance with Einstein’s theory of relativity, at higher speeds the mass of the particle change according to formula

$m = \frac{m_{0}}{\sqrt{1 - (v^{2}/c^{2})}}$