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Question(s) / Instruction(s):

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 700 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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