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Einstein's Photoelectric Equation and Work Function for GUJCET: 15 solved questions

Real GUJCET paper questions on einstein's photoelectric equation and work function, part of dual nature of matter and radiation. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2007 to 2026. No sign-in needed to read them.

What this topic asks

• Speed and kinetic energy of the photoelectrons — 7 questions
• Work function and the photoelectric equation — 5 questions
• Threshold frequency and wavelength — 3 questions

All 15 questions with solutions

• The threshold wavelength for a metal having work function W₀ is λ₀. What is the threshold wavelength for a me… GUJCET 2007
• The photoelectric threshold wavelength for potassium, having a work function of 2 eV, is . (Take h = 6.6×10⁻³… GUJCET 2008
• A photon of energy 8 eV is incident on a metal surface of threshold frequency 1.6×10¹⁵ Hz. The maximum kineti… GUJCET 2008
• In the photoelectric effect, the threshold wavelength of sodium is 5000 A. Find its work function. (h = 6.6×1… GUJCET 2009
• A photosensitive metallic surface has work function φ₀. If photons of energy 3φ₀ fall on this surface, the el… GUJCET 2011
• The kinetic energies of photoelectrons emitted from a metal are k₁ and k₂ when it is irradiated with light of… GUJCET 2013
• The threshold wavelength for lithium metal is 6250 A. For photoemission, the wavelength of the incident light… GUJCET 2014
• The threshold wavelength of sodium is 6800 A. Its work function is ×10⁻¹⁹ J. (h = 6.625×10⁻³⁴ J s; c = 3×10⁸… GUJCET 2016
• Photons of energy 1 eV and 2.5 eV successively illuminate a metal whose work function is 0.5 eV. The ratio of… GUJCET 2015; GUJCET 2017
• Photons of energy 2 eV and 2.5 eV successively illuminate a metal whose work function is 0.5 eV. The ratio of… GUJCET 2019
• The threshold frequency of caesium is 5.16×10¹⁴ Hz. Then its work function is eV. GUJCET 2020
• Which of these metals has the least work function (φ₀)? GUJCET 2021
• The photoelectric cut-off voltage in a certain experiment is 1.5 V. The maximum kinetic energy of photoelectr… GUJCET 2026
• Light of wavelengths λ_A and λ_B is incident on two identical metal plates, and photoelectrons are emitted. I… RS Academy GUJCET booklet
• When light of frequencies f₁ and f₂ falls on two identical photosensitive surfaces, the maximum velocities of… RS Academy GUJCET booklet