Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 5

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Monochromatic light of frequency of $6 \times 10^{14} Hz$ is produced by a LASER. The power emitted is $2 \times 10^{- 3} W$ . The number of photons emitted, on the average, by the source per second is

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Important Questions on Dual Nature of Matter and Radiation

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 7

The anode voltage of a photocell is kept fixed. The wavelength of the light falling on the cathode is gradually changed. The plate current

I

of the photocell varies as follows:

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 8

The graph is showing the photocurrent with the applied voltage of a photoelectric effect experiment. Then

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 9

If

λ = 10^{- 10} m

changes to

λ^{'} = 0.5 \times 10^{- 10} m

, find energy difference

(Δ E)

given to the particle

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 10

The wavelength involved in the spectrum of deuterium

(_{1}^{2} D)

are slightly different from that of hydrogen spectrum, because

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 11

In Davisson-Germer experiment when electron strikes the

N i

-crystal which of the following is produced?

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 12

Electrons with de-Broglie wavelength

λ

fall on the target in an X-ray tube. The cut-off wavelength of the emitted X-ray is:

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 14

The anode voltage of photocell is kept fixed. The wavelength

(λ)

of the light falling on the cathode is gradually changed. The maximum kinetic energy

(K . E .)

of the photoelectrons emitted varies with

λ

as

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Alpha Question Bank for Medical: Physics>Chapter 32 - Dual Nature of Matter and Radiation>Exercise-2>Q 15

A photon of wavelength

λ

(less than threshold wavelength

λ_{0}

) is incident on a metal surface of work function

W_{0}

. The de Broglie wavelength of the ejected electron of mass

m

is :