JEE Main 2022 (Online) 25th June Morning Shift | Atoms and Nuclei Question 63 | Physics

JEE Main 2022 (Online) 25th June Morning Shift

MCQ (Single Correct Answer)

-1

The ratio for the speed of the electron in the 3^rd orbit of He⁺ to the speed of the electron in the 3^rd orbit of hydrogen atom will be :

1 : 1

1 : 2

4 : 1

2 : 1

JEE Main 2022 (Online) 24th June Evening Shift

MCQ (Single Correct Answer)

-1

In Bohr's atomic model of hydrogen, let K, P and E are the kinetic energy, potential energy and total energy of the electron respectively. Choose the correct option when the electron undergoes transitions to a higher level :

All K, P and E increase.

K decreases, P and E increase.

P decreases, K and E increase.

K increases, P and E decrease.

JEE Main 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

-1

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.

JEE Main 2021 (Online) 31st August Morning Shift

MCQ (Single Correct Answer)

-1

A sample of a radioactive nucleus A disintegrates to another radioactive nucleus B, which in turn disintegrates to some other stable nucleus C. Plot of a graph showing the variation of number of atoms of nucleus B versus time is :

(Assume that at t = 0, there are no B atoms in the sample)