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NTA Abhyas JEE Main2020ChemistryStructure of AtomPractice

Number of photons having wavelength 632 .8 nm, emitted by 5 mW laser source in 1 second is

Options

  1. A1.6 × 1 0 19
  2. B1.6 × 1 0 16
  3. C1.6 × 1 0 25
  4. D1.6 × 1 0 13

Correct answer

B. 1.6 × 1 0 16

Step-by-step solution

E = n h c λ 5 × 1 0 - 3 J / s = n × 1240 632.8 × 1.6 × 1 0 - 19 J n = 1.6 × 1 0 16

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