Fireflies emit flashes of light to communicate directly, Physics

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Fireflies emit flashes of light to communicate directly

Fireflies emit flashes of light to communicate, directly converting chemical energy into the energy of visible-light photons. A firefly emits a 0.14-s-long pulse of light with an average wavelength of 600nm . During the flash, the emitted power is 40uW.Assume that all photons have the average wavelength. How many photons does the firefly emit during each flash?

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