Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 73

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An electron in first orbit of hydrogen moves in circular orbit of radius $r$ with velocity $v$ . The current through loop is

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Important Questions on Atoms, Molecules and Nuclei

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 74

When electron jumps from

n = 4

level to

n = 1

level, the angular momentum of electron changes by

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 75

Energy required for the electron excitation in

{Li}^{+ +}

from the first to the third Bohr orbit is

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 76

The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true?

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 77

A photon of wavelength

300 nm

interacts. with a stationary hydrogen atom in ground state. During the interaction, whole energy of the photon is transferred to the electron of the atom. State which possibility is correct. (Consider, Planck's constant

= 4 \times 10^{- 15} eVs

, velocity of light

= 3 \times 10^{8} m s^{- 1},

ionization energy of hydrogen

= 13.6 eV

)

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 80

The energy state of doubly ionised lithium having the same energy as that of the first excited state of hydrogen is

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 81

The angular momentum of an electron in first orbit of

{Li}^{+ +}

ion is:

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 82

The radius of first orbit of hydrogen atom is

0.53 \overset{\circ}{A}

. The radius of its fourth orbit will be

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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 83

The lifetime of an electron in the state

n = 2

in the hydrogen atom is about