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Dual Nature of Radiation and Matter question

2012 · Q131
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Dual Nature of Radiation and Matter question

2012 · Q131

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1
A 200 W sodium street lamp emits yellow light of wavelength 0.6 μ\muμm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is
  1. A
    1.5 ×\times× 1020
  2. B
    6 ×\times× 1018
  3. C
    62 ×\times× 1020
  4. D
    3 ×\times× 1019
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