Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-2>Q 17

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Assertion: Neutrons penetrate matter more readily as compared to protons.

Reason: Neutrons are slightly more massive than protons.

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Important Questions on Atomic Physics

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-2>Q 18

Assertion : Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate.

Reason : According to classical physics all moving electrons radiate.

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-2>Q 19

Assertion: The hydrogen atom consists of only one electron, but its emission spectrum has many lines.

Reason: Only the Lyman series is found in the absorption spectrum of hydrogen atoms whereas in the emission spectrum all the series are found.

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 1

When an

α

-particle of mass

m

moving with velocity

v

bombards on a heavy nucleus of charge

' Z e'

, its distance of closest approach from the nucleus depends on

m

as:

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 2

The ionisation energy of the hydrogen atom in its ground state is

13.6 eV

. The atoms are excited to higher energy levels to emit radiations of

6

wavelengths. Maximum wavelength of emitted radiation corresponds to the transition between

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 3

The energy of a hydrogen atom in the ground state is $- 13.6 eV$ . The energy of a ${He}^{+}$ ion in the first excited state will be

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 4

Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model?

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 5

The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number

Z

of hydrogen like ion is

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Alpha Question Bank for Medical: Physics>Chapter 33 - Atomic Physics>Exercise-3>Q 6

Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths λ1:λ2 emitted in the two cases is: