A lamp emits light of frequency 5 10 15 Hz at a power of 25 W.
Question:
A lamp emits light of frequency 5 × 1015 Hz at a power of 25 W. 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
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