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JIPMER2011ChemistryStructure of Atom

A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm . How many photons are emitted from the lamp per second? (h=6.626 10⁻³⁴ ~J - s . ; velocity of light .=3 10^8 ~ms ⁻¹ )

Options

  1. A1 10¹⁹
  2. B1 10²⁰
  3. C1 10²¹
  4. D1 10²³

Correct answer

C. 1 10²¹

Step-by-step solution

Given, power =600 ~W =331.3 ~nm =331.3 10⁻⁹ ~m Power = energy time = n h v t = n h c t or n= power t h c = 600 331.3 10⁻⁹ 1 6.626 10⁻³⁴ 3 10^8 n=1 10²¹

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