How many photons per second does the led, Physics

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How many photons per second does the led

Problem 25.72

A light-emitting diode (LED) connected to a 3.0 V power supply emits 440 nm blue light. The current in the LED is 21 mA , and the LED is 71 % efficient at converting electric power input into light power output.

Part A

How many photons per second does the LED emit?

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