A difference of 2 . 3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom makes a transition from the upper level to the lower level?

The Separation of two energy levels in an atom, E = 2 . 3 eV = 2 . 3 × 1 . 6 × 10 - 19 = 3 . 68 × 10 - 19 J The relation between energy and frequency is given by, E = h v Where, Planck’s constant h = 6 . 62 × 10 - 34 Js , and, ν is the frequency of radiation. ∴ ν = E ⁄ h = 3 . 68 × 10 - 19 6 . 62 × 10 - 34 = 5 . 55 × 10 14 Hz The radiation frequency is 5 . 6 × 10 14 Hz . Here, the symbols have their usual meaning.

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Atoms>Exercise>Q 5

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The wavelength of light from the spectral emission line of sodium is 589 nm. The kinetic energy at which a neutron would have the same de Broglie wavelength is

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Important Questions on Atoms

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Atoms>Exercise>Q 6

An electron is moving in Bohr's fourth orbit. Its de-Broglie wavelength is

λ

. What is the circumference of the fourth orbit?

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Atoms>Exercise>Q 7

Find out the wavelength of the electron orbiting in the ground state of hydrogen atom.

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Atoms>Exercise>Q 8

Write a short note on Debroglie's explanation of Bohr's second postulate of quantization.

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Atoms>Exercise>Q 9

Write two limitations of Bohr's atomic model.

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Atoms>Exercise>Q 10

Use Bohr's postulate for permitted orbits to prove that the circumstances of the nth permitted orbit for the electron can contain exactly n wavelengths of the de Broglie wavelength associated with the electron in that orbit.

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Atoms>Exercise>Q 11

If the series limit of Lyman series for hydrogen atom is equal to the series limit of Balmer series for a hydrogen-like atom, then the atomic number of this hydrogen like atom will be

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Atoms>Exercise>Q 12

Which of the following is true of the Balmer series of the hydrogen spectrum?

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 12 - Atoms>Exercise>Q 13

Rydberg unit of energy is equal to: