Photoelectric Effect & Einstein's Equation questions with solutions

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• MCQmediumPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  If p represents radiation pressure, c represents the speed of light and q represents radiation energy incident per unit area per second, then for what values of x, y and z, the quantity $p^{x}q^{y}c^{z}$ will be dimensionless?

  Options

  • Option A

    x = y = z = 1

  • Option B

    x = -y = z

  • Option C

    x = y = -z = 1

  • Option D

    x = -y = -z = 1

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  JEE Advanced Practice

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• MCQmediumPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  Two monochromatic radiations of frequencies ν and ν/2 give stopping potentials Vₛ/2 and Vₛ, respectively. What is the threshold frequency?

  Options

  • Option A

    2ν

  • Option B

    3ν

  • Option C

    (2/3)ν

  • Option D

    (3/2)ν

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  NEET 2022NEET Previous Year

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• MCQeasyPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  A photocell employs photoelectric effect to convert:

  Options

  • Option A

    change in light frequency into electric current change

  • Option B

    change in light frequency into voltage change

  • Option C

    change in illumination intensity into change in photoelectric current

  • Option D

    change in intensity into change in cathode work function

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  AIPMT 2006NEET Previous Year

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• MCQmediumPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  A convex lens of focal length 40 cm forms an image of an extended source of light on a photo-electric cell. A current I is produced. The lens is replaced by another convex lens having the same diameter but focal length 20 cm. The photoelectric current now is :

  Options

  • Option A

    I/2

  • Option B

    4I

  • Option C

    2I

  • Option D

    I

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  JEE Mains 2024

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• MCQmediumPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  In photo electric effect
  A. The photocurrent is proportional to the intensity of the incident radiation.
  B. Maximum Kinetic energy with which photoelectrons are emitted depends on the intensity of incident light.
  C. Max K.E with which photoelectrons are emitted depends on the frequency of incident light.
  D. The emission of photoelectrons require a minimum threshold intensity of incident radiation.

  E. Max. K.E of the photoelectrons is independent of the frequency of the incident light.

  Choose the correct answer from the options given below:

  Options

  • Option A

    B and C only

  • Option B

    A and C only

  • Option C

    A and E only

  • Option D

    A and B only

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  JEE Mains8 April 2023Shift 2Evening Shift

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• MCQmediumPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  A 5 W monochromatic light source of wavelength 5000 Å liberates electrons from a surface at 0.5 m distance. If moved to 1.0 m, emission count is reduced by a factor of:

  Options

  • Option A

    8

  • Option B

    16

  • Option C

    2

  • Option D

    4

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  AIPMT 2007NEET Previous Year

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• NumericmediumPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  A point source of light is placed at the centre of curvature of a hemispherical surface. The source emits a power of 24 W. The radius of curvature of hemisphere is 10 cm and the inner surface is completely reflecting. The force on the hemisphere due to the light falling on it is ______ × 10⁻⁸ N.

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  JEE Mains30 January 2023Shift 1Morning Shift

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• MCQmediumPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  A graph plots photocurrent against anode potential for three incident radiations a, b, c. Which statement is correct? [Image]

  Options

  • Option A

    a and b have different frequencies and intensities

  • Option B

    a and b have the same frequency but different intensities

  • Option C

    b and c have different frequencies and intensities

  • Option D

    b and c have the same frequency and intensity

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  AIPMT Screening 2009NEET Previous Year

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• MCQeasyPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  UV light of 4.13 eV is incident on a photosensitive metal surface having work function 3.13 eV. The maximum kinetic energy of ejected photoelectrons will be :

  Options

  • Option A

    4.13 eV

  • Option B

    1 eV

  • Option C

    3.13 eV

  • Option D

    7.26 eV

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  JEE Mains 2024 09 Apr Evening Shift

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• MCQmediumPhotoelectric effect and dual naturePhotoelectric Effect & Einstein's Equation

  A plate of mass 20 g is held in equilibrium in air by a light beam as shown. The plate is perfectly absorbing. Find the beam power.

  

  Options

  • Option A

    7 × 10⁷ W

  • Option B

    6 × 10⁸ W

  • Option C

    6 × 10⁷ W

  • Option D

    7 × 10⁸ W

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  JEE Advanced Practice

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