A Laser Emits a Single, 3

question 37

Multiple Choice

A laser emits a single, 3.0-ms pulse of light that has a frequency of 2.83 × 10¹¹ Hz and a total power of 65 000 W. How many photons are in the pulse?

• A)6.0 × 10²³
• B)1.2 × 10²⁴
• C)2.4 × 10²⁵
• D)3.6 × 10²⁵
• E)4.8 × 10²⁶

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