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Photons are incident from vacuum on a transparent material with a refractive index $1.50$ for a given wavelength. The momentum of the incident photon, if its wavelength in the material is equal to $λ$ , is $\frac{h}{n λ}$ . Value of $n$ , is

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Important Questions on Dual Nature of Radiation and Matter

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 2

The kinetic energy of the most energetic photo-electron emitted from a metal surface is doubled when the wavelength of the incident radiation is reduced from

λ_{1}

λ_{2}

. The work function of the metal is

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 3

When a certain photosensitive surface is illuminated with monochromatic light of wavelength

λ

, the stopping potential for photoelectric current is

2 V_{0}

. When the same surface is illuminated with monochromatic light of wavelength

2 λ

, the stopping potential is

\frac{V_{0}}{2}

. The threshold wavelength for photoelectric emission is:

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 5

When a metallic surface is illuminated with monochromatic light of wavelength

λ

, the stopping potential is

5 V_{0}

. When the same surface is illuminated with light of wavelength

3 λ

, the stopping potential is

V_{0}

. Then the work function of the metallic surface is (Here

h

= Planck's constant and

c

= Speed of light)

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 48

Energy from the sun is received on the earth at the rate of

2 cal / {cm}^{2} / \min

. If average wavelength of solar light be taken at

5500 Å

, then photons received on the face of earth facing the sun in

1

hour (approx.), is

1.76 \times 10^{N}

. Value of

N

, is
(

1

cal =

4.2 J

, Radius of earth

= 6400 km

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 63

Light of wavelength

2000 Å

falls on a metallic surface whose work function is

4.21 eV

. Calculate the stopping potential.

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment Set-2>Q 42

When ultraviolet radiation is incident on a surface, no photoelectrons are emitted. It is possible to cause emission by using

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 7

Two photons of energies twice and thrice the work function of a metal surface. Then the ratio of maximum velocities of the photoelectrons emitted in the two cases respectively is

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Gamma Question Bank for Engineering Physics>Chapter 27 - Dual Nature of Radiation and Matter>Assignment>Q 1

The stopping potential for photo electron emitted from a metal surface of work function

1.7 eV

10.4 V .

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Photons are incident from vacuum on a transparent material with a refractive index 1.50 for a given wavelength. The momentum of the incident photon, if its wavelength in the material is equal toλ, is hnλ. Value of n, is

Important Questions on Dual Nature of Radiation and Matter

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Photons are incident from vacuum on a transparent material with a refractive index $1.50$ for a given wavelength. The momentum of the incident photon, if its wavelength in the material is equal to $λ$ , is $\frac{h}{n λ}$ . Value of $n$ , is