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A Light-Emitting Diode Emits One Microwatt of 640 Nm Photons

Question 71

Multiple Choice

A light-emitting diode emits one microwatt of 640 nm photons. How many photons are emitted each second?

A) 2.5 × 10²⁰
B) 9.7 × 10²⁰
C) 2.0 × 10³¹
D) 3.0 × 10²¹
E) 3.2 × 10¹²

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