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The elliptical orbits of electron in the atom were proposed by

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Important Questions on Modern Physics

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 226

The equation,

$4_{1} H^{1} ⟶ {}_{2}{He}^{4} + 2 e^{+} + 26 MeV$ represents

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 227

Planck's constant has the same dimensions as

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 1

A ray of light of wavelength

5030 \overset{\circ}{A}

is incident on a totally reflecting surface. The momentum delivered by the ray is equal to (Planck's constant

h = 6.63 \times 10^{- 34} J s

)

MEDIUM

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IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 2

What is the binding energy per nucleon of

{}_{6}C^{12}

nucleus? Given, the mass of

C^{12} (m_{c}) = 12.000 u

, Mass of the proton

(m_{p}) = 1.0078 u

, Mass of neutron

(m_{n}) = 1.0087 u

and

1 amu = 931.4 \frac{MeV}{c^{2}}

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 3

The energy of

24.6 eV

is required to remove one of the electrons from a neutral helium atom. The energy (in

eV

) required to remove both the electrons from a neutral helium atom is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 4

If the radius of first Bohr's orbit is

x

, then the de-Broglie wavelength of an electron in the third orbit is nearly

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 5

A star initially has

10^{40}

deuterons. It produces energy via the processes

{}_{1}^{2}H + {}_{1}^{2}H \to {}_{1}^{3}H + p

and

{}_{1}^{2}H + {}_{1}^{3}H \to {}_{2}^{4}{He} + n

where, the masses of the nuclei are

m ({}^{2}H) = 2.014 amu

m (p) = 1.007 amu

m (n) = 1.008 amu

and

m ({}^{4}{He}) = 4.001 amu

, if the average power radiated by the star is

10^{16} W

. The deuteron supply of the star is exhausted in a time of the order of

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 2]>Q 6

Assuming that about

200 MeV

energy is released per fission of

{}_{92}U^{235}

nuclei. What would be the mass of

U^{235}

consumed per day in the fission of reactor of power

1 MW

approximately?

The elliptical orbits of electron in the atom were proposed by

Important Questions on Modern Physics

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