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NEET2026PhysicsChapterActual

The threshold wavelength for a certain photosensitive surface is ₀ . When light of wavelength ₀ 3 falls on it, the maximum kinetic energy of the ejected photoelectrons is:

Options

  1. Ahc ₀
  2. B2hc ₀
  3. C3hc ₀
  4. D4hc ₀

Correct answer

B. 2hc ₀

Step-by-step solution

The work function of the photosensitive surface is given by = hc ₀ . The energy of the incident light of wavelength = ₀ 3 is E = hc = 3hc ₀ . According to Einstein's photoelectric equation, the maximum kinetic energy of the ejected photoelectrons is: K_ max = E - K_ max = 3hc ₀ - hc ₀ = 2hc ₀ Answer: 2hc ₀

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