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Photoelectric Effect

The photoelec...

Question

The photoelectric effect supports quantum nature of light because

A

there is a minimum frequency of light below which the no photoelectrons are emitted

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B

the maximum kinetic energy of photoelectrons depend only on the frequency of light and not on its intensity

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C

even when metal surface is faintly illuminated, the photoelectrons leave the surface immediately

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D

all of the above

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Solution

The correct option is B all of the above
The minimum frequency is required for the emission of the photoelectrons from the surface of the material.
The photoelectric effect supports quantum nature of light because the maximum kinetic energy of photo-electrons depends only on the frequency of light and not on its intensity.
Note:
The photoelectric effect can be explained by assuming that light consists of quanta.
A photon strikes a metal surface, its energy is absorbed by the metal, this results in the emission of electrons.

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Q. Photoelectric effect supports quantum nature of light because
a) There is a minimum frequency of light below which no photoelectrons are emitted.
b) The maximum kinetic energy of photo electrons depends only on the frequency.
c) Even when the metal surface is faintly illuminated, the photoelectrons leave the surface immediately.

Q. Photoelectric effect supports quantum nature of light because
(a) there is a minimum frequency below which no photoelectrons are emitted
(b) the maximum kinetic energy of photoelectrons depends only on the frequency of light and not on its intensity
(c) even when the metal surface is faintly illuminated the photoelectrons leave the surface immediately
(d) electric charge of the photoelectrons is quantised

Q. In a photoelectric effect experiment, the maximum kinetic energy of the ejected photoelectrons is measured for various wavelengths of the incident light. Figure shows a graph of this maximum kinetic energy

K_{m a x}

as a function of the wavelength

λ

of the light falling on the surface of the metal. Which of the following statements is/are correct?

Q. When light of sufficiently high frequency is incident on a metallic surface, electrons are emitted from the metallic surface. This phenomenon is called photoelectric emission. Kinetic energy of the emitted photoelectrons depends on the wavelength of incident light and is independent of the intensity of light. Number of emitted photoelectrons depends on intensity.

(h ν - ϕ)

is the maximum kinetic energy of emitted photoelectrons (where

ϕ

is the work function of metallic surface). Reverse effect of photo emission produces X-ray. X-ray is not deflected by electric and magnetic fields. Wavelength of a continuous X-ray depends on potential difference across the tube. Wavelength of characteristic X-ray depends on the atomic number. If potential difference across the tube is increased then:

Q. When a light of frequency

v_{1}

is incident on a metal surface, the photoelectrons emitted have twice the kinetic energy as did the photoelectrons emitted when the same metal has irradiated with light of frequency

v_{2}

. What will be the value of threshold frequency?

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