# Atoms and Nuclei · Physics · WB JEE

Start Practice## MCQ (Single Correct Answer)

WB JEE 2008

The ionisation potential of hydrogen atom is $$-$$13.6 eV. An electron in the ground state of a hydrogen atom absorbs a photon of energy 12.75 eV. How...

WB JEE 2008

Which of the following statements is correct?

WB JEE 2024

Which of the following statement(s) is/are truc in respect of nuclear binding energy ?
(i) The mass energy of a nucleus is larger than the total mass ...

WB JEE 2023

If the potential energy of a hydrogen atom in the first excited state is assumed to be zero, then the total energy of n = $$\infty$$ state is,

WB JEE 2022

If the kinetic energies of an electron, an alpha particle and a proton having same de-Broglie wavelength are $${\varepsilon _1},{\varepsilon _2}$$ and...

WB JEE 2022

Suppose in a hypothetical world the angular momentum is quantized to be even integral multiples of $${h \over {2\pi }}$$. The largest possible wavelen...

WB JEE 2021

A 12.5 eV electron beam is used to bombard gaseous hydrogen at ground state. The energy level upto which the hydrogen atoms would be excited is

WB JEE 2021

Let r, v, E be the radius of orbit, speed of electron and total energy of electron respectively in H-atom. Which of the following quantities according...

WB JEE 2020

If R is the Rydberg constant in cm-1, then hydrogen atom does not emit any radiation of wavelength in the range of

WB JEE 2020

A nucleus X emits a $$\beta $$-particle to produce a nucleus Y. If their atomic masses are Mx and My respectively, then the maximum energy of the $$\b...

WB JEE 2020

For nuclei with mass number close to 119 and 238, the binding energies per nucleon are approximately 7.6 MeV and 8.6 MeV, respectively. If a nucleus o...

WB JEE 2019

A parent nucleus X undergoes $$\alpha$$-decay with a half-life of 75000 yrs. The daughter nucleus Y undergoes $$\beta$$-decay with a half-life of 9 mo...

WB JEE 2019

A proton and an electron initially at rest are accelerated by the same potential difference. Assuming that a proton is 2000 times heavier than an elec...

WB JEE 2019

To which of the following the angular velocity of the electron in the n-th Bohr orbit is proportional?

WB JEE 2018

How the linear velocity v of an electron in the Bohr orbit is related to its quantum number n?

WB JEE 2018

If the half-life of a radioactive nucleus is 3 days, nearly what fraction of the initial number of nuclei will decay on the third day? (Given, $$\root...

WB JEE 2018

An electron accelerated through a potential of 10000 V from rest has a de-Broglie wave length $$\lambda$$. What should be the accelerating potential, ...

WB JEE 2017

The de-Broglie wavelength of an electron is $$0.4 \times {10^{ - 10}}$$ m when its kinetic energy is 1.0 keV. Its wavelength will be $$1.0 \times {10^...

WB JEE 2017

Radon-222 has a half-life of 3.8 days. If one starts with 0.064 kg of radon-222 left after 19 days will be

## MCQ (More than One Correct Answer)

WB JEE 2023

A uniform magnetic field B exists in a region. An electron of charge q and mass m moving with velocity v enters the region in a direction perpendicula...

WB JEE 2022

A sample of hydrogen atom in its ground state is radiated with photons of 10.2 eV energies. The radiation from the sample is absorbed by excited ioniz...

WB JEE 2017

Let vn and En be the respective speed and energy of an electron in the nth orbit of radius rn, in a hydrogen atom, as predicted by Bohr's model. Then...