A Pulsed Laser Has an Average Output Power of 4

question 15

Multiple Choice

A pulsed laser has an average output power of 4.0 W. Each pulse consists of light at wavelength 5.0 × 10^-7 m and has a 25 ms duration. How many photons are emitted in a single pulse?

• A)1.0 × 10¹⁷
• B)2.5 × 10¹⁷
• C)3.7 × 10¹⁷
• D)5.0 × 10¹⁷
• E)7.4 × 10¹⁷

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