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Dual Nature of Radiation and Matter · Question 59

AIPMT 2009MCQEasy📈 Topic in 25% papers+4−1
1

The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement? [figure]

  1. Curves (a) and (b) represent incident radiations of same frequency but of different intensities.
  2. Curves (b) and (c) represent incident radiations of different frequencies and different intensities.
  3. Curves (b) and (c) represent incident radiations of same frequency having same intensity.
  4. Curves (a) and (b) represent incident radiations of different frequencies and different intensities.

Answer

(1) Curves (a) and (b) represent incident radiations of same frequency but of different intensities.

Solution

As per NCERT, the stopping potential depends only on the frequency, and the saturation current depends only on the intensity.

Curves a and b: same stopping potential same frequency; different saturation currents different intensities.

Curves b and c: different stopping potentials different frequencies; same saturation current same intensity.

Curves (a) and (b) represent radiations of same frequency but of different intensities.

Answer: (1)

AIPMT 2009

Keep practising — Dual Nature of Radiation and Matter

2

Monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9 mW. The number of photons arriving per sec. on the average at a target irradiated by this beam is

  1. 3 1016
  2. 9 1015
  3. 3 1019
  4. 9 1017
AIPMT 2009
3

The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the

  1. infrared region
  2. X-ray region
  3. Ultraviolet region
  4. Visible region
AIPMT 2008
4

A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 106 m s-1. The velocity of the particle is

  1. 3 10-31 m s-1
  2. 2.7 10-21 m s-1
  3. 2.7 10-18 m s-1
  4. 9 10-2 m s-1
AIPMT 2008
5

Monochromatic light of frequency 6.0 1014 Hz is produced by a laser. The power emitted is 2 10-3 W. The number of photons emitted, on the average, by the source per second is

  1. 5 1016
  2. 5 1017
  3. 5 1014
  4. 5 1015
AIPMT 2007
6

A 5 watt source emits monochromatic light of wavelength 5000 A. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will be reduced by a factor of

  1. 8
  2. 16
  3. 2
  4. 4
AIPMT 2007
7

A photocell employs photoelectric effect to convert

  1. change in the frequency of light into a change in the electric current
  2. change in the frequency of light into a change in electric voltage
  3. change in the intensity of illumination into a change in photoelectric current
  4. change in the intensity of illumination into a change in the work function of the photocathode.
AIPMT 2006
8

When photons of energy h fall on an aluminium plate (of work function E0), photoelectrons of maximum kinetic energy K are ejected. If the frequency of radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be

  1. K + h
  2. K + E0
  3. 2K
  4. K.
AIPMT 2006
9

In a discharge tube ionization of enclosed gas is produced due to collisions between

  1. neutral gas atoms/molecules
  2. positive ions and neutral atoms/molecules
  3. negative electrons and neutral atoms/molecules
  4. photons and neutral atoms/molecules.
AIPMT 2006
10

The momentum of a photon of energy 1 MeV in kg m/s will be

  1. 5 10-22
  2. 0.33 106
  3. 7 10-24
  4. 10-22
AIPMT 2006
11

The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation the metals which will emit photoelectrons for a radiation of wavelength 4100 A is/are

  1. A only
  2. A and B only
  3. all the three metals
  4. none
AIPMT 2005

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