A Laser Pulse of Duration 25 Ms Has a Total

question 63

Multiple Choice

A laser pulse of duration 25 ms has a total energy of 1.4 J.If the wavelength of this radiation is 567 nm,how many photons are emitted in one pulse? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s)

• A)4.0 × 10¹⁸
• B)9.9 × 10¹⁹
• C)4.8 × 10¹⁹
• D)1.6 × 10¹⁷
• E)3.2 × 10¹⁷

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