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MHT CET202020 Oct 2020Morning ShiftPhysicsDual Nature of MatterActual

A photon of wavelength 3315 Ã… falls on a photocathode and an electron of energy 3 10⁻¹⁹ ~J is ejected. The threshold wavelength of photon is [Planck's constant (h) =6.63 10⁻³⁴ ~J - s , velocity of light .( c )=3 10⁸ ~m / s ]

Options

  1. A6630 Å
  2. B3315 Å
  3. C5000 Å
  4. D1130 Å

Correct answer

A. 6630 Å

Step-by-step solution

₀= h c -E= 6.63 10⁻³⁴ 3 10⁸ 3315 10⁻¹⁰ -3 10⁻¹⁹=(6-3) 10⁻¹⁹=3 10⁻¹⁹ ₀= hc ₀ = 6.63 10⁻³⁴ 3 10⁸ 3 10⁻¹⁹ 6630 ~Å

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