JEE Main 2022 (Online) 24th June Evening Shift | Atoms and Nuclei Question 78 | Physics

JEE Main 2022 (Online) 24th June Evening Shift

MCQ (Single Correct Answer)

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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 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

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Nucleus A is having mass number 220 and its binding energy per nucleon is 5.6 MeV. It splits in two fragments 'B' and 'C' of mass numbers 105 and 115. The binding energy of nucleons in 'B' and 'C' is 6.4 MeV per nucleon. The energy Q released per fission will be :

0.8 MeV

275 MeV

220 MeV

176 MeV

JEE Main 2021 (Online) 1st September Evening Shift

MCQ (Single Correct Answer)

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Out of Syllabus

The half life period of radioactive element x is same as the mean life time of another radioactive element y. Initially they have the same number of atoms. Then :

x-will decay faster than y.

y-will decay faster than x.

x and y have same decay rate initially and later on different decay rate.

x and y decay at the same rate always.

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