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If an orbital electron of the hydrogen atom jumps from the ground state to a higher energy state, its orbital speed reduces to half its initial value. If the radius of the electron orbit in the ground state is r, then the radius of the new orbit would be :

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Important Questions on Atomic Physics

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 29
In the Bohr model of the hydrogen atom, the ratio of the kinetic energy to the total energy of the electron in a quantum state n is :
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 30
The innermost orbit of the hydrogen atom has a diameter of 1.06 Å. What is the diameter of the tenth orbit ?
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 31
The orbital speed of the electron in the ground state of hydrogen is v. What will be its orbital speed when it is excited to the energy state – 3.4 eV ?
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 32
The total energy of the electron in the first excited state of hydrogen is – 3.4 eV. What is the kinetic energy of the electron in this state ?
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 33
The total energy of the electron in the first excited state of hydrogen is –3.4 eV. the potential energy of the electron is :
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 34
Imagine an atom made of a proton and a hypothetical particle of double the mass as that of an electron but the same charge. Apply Bohr theory to consider transitions of the hypothetical particle to the ground state. Then, the longest wavelength (in terms of Rydberg constant for hydrogen atom) is
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 35
It is observed that some of the spectral lines in hydrogen spectrum have wavelengths almost equal to those of the spectral lines in He+ ion, Out of the following the transitions in He+ that will make this possible is
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 36

The ionization energy of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by electromagnetic radiation of energy 12.1 eV. How many spectral lines will be emitted by the hydrogen atoms?