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.

Question

Quizplus · Accepted Answer

The energy of one photon is calculated using E = hf, where h is Planck's constant and f is the frequency. The number of photons per second is the power divided by the energy per photon.

A Lamp Emits Light of Frequency 5 * 1015 Hz

A Lamp Emits Light of Frequency 5 * 10¹⁵ Hz