A ruby laser emits an intense pulse of light that lasts a, Physics

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A ruby laser emits an intense pulse of light that lasts a

A ruby laser emits an intense pulse of light that lasts a mere 30 ns. The light has a wavelength of 690 nm, and each pulse has an energy of 200 mJ. (A) How many photons are emitted in each pulse? (B) What is the rate of photon emission, in photons per second, during the 30 ns that the laser is "on"?

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Physics: A ruby laser emits an intense pulse of light that lasts a

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