Question: A ruby laser emits an intense pulse of light that lasts a mere 3 0 nsns . The light has a wavelength of 6 9

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

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