Test: Subatomic Particles - NEET MCQ

Charge of an electron is
= −1.6 × 10⁻¹⁹C
Mass of electron is
9.1 × 10⁻³¹kg = 9.1 × 10⁻²⁸g
Thus, Charge/mass ratio is

- ve sign is only a convention used by us
= - 1.76 × 10⁸ coulombs/g

Mass of electron = 9.1096 x 10^-31 kg

= 1.098 x 10²⁷ electrons

Charge carried by one electron
= 1.6022 x 10^-19 C
Electrons presents in 5.5 x 10^-16 C

The value (magnitude) of electron charge was determined by Millikan's oil drop experiment.
Cathode ray discharge tube experiment gave the sign of electron charge Rutherford's experiment gave the presence of electrons around the dense nucleus
Photoelectric experiment explained the production of electricity from light irradiation on the metal surface.

(A) Mass of electron = 9.1 × 10⁻³¹ Kg
(B) Mass of proton = 1.673 × 10⁻²⁷ kg
(C) Charge of electron = −1.602 × 10⁻¹⁹ C
(D) e/m for an electron = 1.76 × 10⁸ C/g
Thus option B is the correct answer.