Question

The mass of a photo electron is(a) 9.1×10⁻²⁷ kg(b) 9.1×10⁻²⁹ kg(c) 9.1×10⁻³¹ kg(d) 9.1×10⁻³⁴ kg

Answer 1

Answer:

c) 9.1x10^-31 this is the rest mass of electron.

Explanation:

A photo electron may have some velocity or we can say some energy associated with it ,therefore it's mass increases.

And if the electron speed is comparable with speed of light it's mass is calculated as-

mr = m0 / sqrt (1 – v2 / c2 ).

Answer 2

Answer:

The correct answer is c) 9.1 x10-31.