question based on photoelectric effect questions with solutions

Showing 1–10 of 82 questions

• MCQeasyPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  The work function of a substance is 3.0 eV. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately:

  Options

  • Option A

    215 nm

  • Option B

    414 nm

  • Option C

    400 nm

  • Option D

    200 nm

  Check answerShow answer

  JEE Mains 2024 30 Jan Morning Shift

  Open question & full solution →
• MCQeasyPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  Assertion: A negative potential is required to stop photoelectrons. Reason: The speed of an electron decreases when a negative retarding potential is applied in a photocell.

  Options

  • Option A

    Assertion correct, Reason false

  • Option B

    Assertion correct and Reason correct

  • Option C

    Assertion false, Reason correct

  • Option D

    Assertion false and Reason false

  Check answerShow answer

  JEE Mains 2025 29 Jan Morning Shift

  Open question & full solution →
• NumericmediumPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  A metal surface is illuminated first with monochromatic light of wavelength λ and then with light of wavelength 2λ. Both radiations produce photoelectric emission. The corresponding maximum photoelectron kinetic energies are 5.0 eV and 1.5 eV respectively. Take hc = 1240 eV·nm. If the threshold wavelength of the metal is N nm, find N.

  Your answer

  Check answerShow answer

  JEE MainsNEETJEE Advanced

  Open question & full solution →
• MCQmediumPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  A metal surface illuminated by wavelength λ has stopping potential V₀. When illuminated by wavelength 2λ, the stopping potential becomes V₀/4. The threshold wavelength is:

  Options

  • Option A

    3λ/2

  • Option B

    4λ

  • Option C

    3λ

  • Option D

    λ/4

  Check answerShow answer

  JEE Mains11 April 2023Shift 1Morning Shift

  Open question & full solution →
• NumericmediumPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  An isotropic ultraviolet source emits 4.0 W entirely in photons of energy 20 eV. A small gas cell of effective collecting area 5.0 cm² is located 2.0 m from the source. Assume that 2% of all photons entering the cell produce one photoionisation event. Take 1 eV = 1.6×10⁻¹⁹ J. If the photoionisation rate is approximately N×10¹⁰ s⁻¹, find N.

  Your answer

  Check answerShow answer

  JEE MainsNEETJEE Advanced

  Open question & full solution →
• MCQeasyPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  Given below are two statements : Statement I : Stopping potential in photoelectric effect does not depend on the power of the light source. Statement II : For a given metal, the maximum kinetic energy of the photoelectron depends on the wavelength of the incident light. In the light of above statements, choose the most appropriate answer from the options given below.

  Options

  • Option A

    Statement I is incorrect but statement II is correct

  • Option B

    Both Statement I and Statement II are incorrect

  • Option C

    Statement I is correct but statement II is incorrect

  • Option D

    Both statement I and statement II are correct

  Check answerShow answer

  JEE Mains25 January 2023Shift 2Evening Shift

  Open question & full solution →
• A/ReasyPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

  Assertion

  The beam of electrons shows wave nature and exhibits interference and diffraction.

  Reason

  Davisson-Germer experiment experimentally verified the wave nature of electrons.

  Options

  • Option A

    A is correct but R is not correct

  • Option B

    A is not correct but R is correct

  • Option C

    Both A and R are correct but R is NOT the correct explanation of A

  • Option D

    Both A and R are correct and R is the correct explanation of A

  Check answerShow answer

  JEE Mains31 January 2023Shift 1Morning Shift

  Open question & full solution →
• NumericmediumPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  A perfectly reflecting hollow conical surface is placed with its axis parallel to an incident collimated light beam. The entire beam of power 30 W strikes the inner conical surface and is specularly reflected. The semi-vertical angle of the cone is 30°. Take c = 3×10⁸ m·s⁻¹. If the net force on the cone along its axis is N×10⁻⁸ N, find N.

  Your answer

  Check answerShow answer

  JEE MainsNEETJEE Advanced

  Open question & full solution →
• MCQmediumPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  Which figure shows the correct variation of applied potential difference (V) with photoelectric current (I) at two different intensities of light (I₁ < I₂) of same wavelengths:

  Options

  • Option A

    
  • Option B

    
  • Option C

    
  • Option D

    

  Check answerShow answer

  JEE Mains 2024 04 Apr Morning Shift

  Open question & full solution →
• MCQeasyPhotoelectric effect and dual nature of matterquestion based on photoelectric effect

  Monochromatic light of frequency 6 × 10¹⁴ Hz is produced by a laser. The power emitted is 2 × 10⁻³ W. How many photons per second on an average are emitted by the source? (Given h = 6.63 × 10⁻³⁴ J s)

  Options

  • Option A

    9 × 10¹⁸

  • Option B

    6 × 10¹⁵

  • Option C

    5 × 10¹⁵

  • Option D

    7 × 10¹⁶

  Check answerShow answer

  JEE Mains 2024 01 Feb Evening Shift

  Open question & full solution →