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When an electron in a Hydrogen atom revolves in a stationary orbit, it
 

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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 71
An electron revolves around the nucleus. The radius of the circular orbit is r . To double the kinetic energy of electron its orbit radius is
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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 72
The fact that photons carry energy was established by
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Physics Crash Course MHT-CET>Chapter 23 - Atoms, Molecules and Nuclei>Exercise 1>Q 73

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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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 inLi++ 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 =4×10-15eVs , velocity of light =3×108m s-1, ionization energy of hydrogen =13.6eV )
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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