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A Lamp Emits Light of Frequency 5 * 1015 Hz

Question 26

Multiple Choice

A lamp emits light of frequency 5 * 1015 Hz at a power of 25 W and Planck's constant is 6.6 * 10-34 J·s.The number of photons given off per second is


A) 1.3 * 10-19.
B) 8.3 * 10-17.
C) 7.6 * 1018.
D) 1.9 * 1050.

Correct Answer:

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