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## MCQ (More than One Correct Answer)

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A sample of hydrogen atom in its ground state is radiated with photons of 10.2 eV energies. The radiation from the sampl...
WB JEE 2022
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 pr...
WB JEE 2017

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Suppose in a hypothetical world the angular momentum is quantized to be even integral multiples of $${h \over {2\pi }}$$...
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If the kinetic energies of an electron, an alpha particle and a proton having same de-Broglie wavelength are $${\varepsi... WB JEE 2022 Let r, v, E be the radius of orbit, speed of electron and total energy of electron respectively in H-atom. Which of the ... WB JEE 2021 A 12.5 eV electron beam is used to bombard gaseous hydrogen at ground state. The energy level upto which the hydrogen at... WB JEE 2021 If R is the Rydberg constant in cm-1, then hydrogen atom does not emit any radiation of wavelength in the range of... WB JEE 2020 To which of the following the angular velocity of the electron in the n-th Bohr orbit is proportional? WB JEE 2019 A proton and an electron initially at rest are accelerated by the same potential difference. Assuming that a proton is 2... WB JEE 2019 An electron accelerated through a potential of 10000 V from rest has a de-Broglie wave length$$\lambda$$. What should b... WB JEE 2018 If the half-life of a radioactive nucleus is 3 days, nearly what fraction of the initial number of nuclei will decay on ... WB JEE 2018 How the linear velocity v of an electron in the Bohr orbit is related to its quantum number n? WB JEE 2018 Radon-222 has a half-life of 3.8 days. If one starts with 0.064 kg of radon-222 left after 19 days will be WB JEE 2017 The de-Broglie wavelength of an electron is$$0.4 \times {10^{ - 10}}$$m when its kinetic energy is 1.0 keV. Its wavele... WB JEE 2017 Which of the following statements is correct? WB JEE 2008 The ionisation potential of hydrogen atom is$$-13.6 eV. An electron in the ground state of a hydrogen atom absorbs a ...
WB JEE 2008

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