A ruby laser emits an intense pulse of light that lasts a mere 10 ns . The light has a wavelength of 690 nm , and each pulse has an energy of 400 mJ . How many photons are emitted in each pulse? What is the rate of photon emission, in photons per second, during the 10 nsns that the laser is "on"?

A ruby laser emits an intense pulse of light that lasts a mere 10 ns . The light has a wavelength of 690 nm , and each pulse has an energy of 400 mJ . How many photons are emitted in each pulse? What is the rate of photon emission, in photons per second, during the 10 nsns that the laser is "on"?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter24: Electromagnetic Waves

Section: Chapter Questions

Problem 54P

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Question

A ruby laser emits an intense pulse of light that lasts a mere 10 ns . The light has a wavelength of 690 nm , and each pulse has an energy of 400 mJ .

How many photons are emitted in each pulse?

What is the rate of photon emission, in photons per second, during the 10 nsns that the laser is "on"?

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