JEE Main 2022 · 24 Jun · Shift 1 · Physics Q44

PhysicsSingle correct+4 / -1Question 44 of 90

Choose the correct option from the following options given below :

In the ground state of Rutherford's model electrons are in stable equilibrium. While in Thomson's model electrons always experience a net-force.

An atom has a nearly continuous mass distribution in a Rutherford's model but has a highly non-uniform mass distribution in Thomson's model

A classical atom based on Rutherford's model is doomed to collapse.

The positively charged part of the atom possesses most of the mass in Rutherford's model but not in Thomson's model.

Answer and worked solution

Official answer: C

Check each statement.

A: false. Electrons in Rutherford's model are not in stable equilibrium (they must orbit), while in Thomson's model an electron at its equilibrium position feels no net force.
B: false. It is the other way round: Thomson's mass is spread nearly uniformly, Rutherford's is concentrated in the nucleus.
C: true. An orbiting (accelerating) electron radiates classically, loses energy and spirals into the nucleus.
D: false. In both models the positive part carries most of the mass.

(C)

Topics:Rutherford model

JEE Main 2022 · 24 Jun · Shift 1, Physics question 44