WB JEE 2021 | Atoms and Nuclei Question 13 | Physics

WB JEE 2021

MCQ (Single Correct Answer)

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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

MCQ (Single Correct Answer)

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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 to Bohr theory, is proportional to the quantum number n ?

$${r \over E}$$

$${r \over v}$$

WB JEE 2020

MCQ (Single Correct Answer)

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

$${1 \over R}$$ to $${4 \over {3R}}$$ cm

$${7 \over 5R}$$ to $${19 \over {5R}}$$ cm

$${4 \over R}$$ to $${36 \over {5R}}$$ cm

$${9 \over R}$$ to $${144 \over {7R}}$$ cm

WB JEE 2020

MCQ (Single Correct Answer)

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A nucleus X emits a $$\beta $$-particle to produce a nucleus Y. If their atomic masses are M_x and M_y respectively, then the maximum energy of the $$\beta $$-particle emitted is (where, m_e is the mass of an electron and c is the velocity of light)

$$({M_x} - {M_y} - {m_e}){c^2}$$

$$({M_x} - {M_y} + {m_e}){c^2}$$

$$({M_x} - {M_y} ){c^2}$$

$$({M_x} - {M_y} - {2m_e}){c^2}$$

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