A Light-Emitting Diode Has a Power Output of 0

question 33

Multiple Choice

A light-emitting diode has a power output of 0.3 W. If 590 nm is the average wavelength of the source, about how many photons are emitted per second? (h = 6.63 *10^-34 J.s, c = 3.00 *10⁸ m/s, and 1 nm = 10^-9 m)

• A) 10²¹
• B) 10²⁵
• C) 10¹⁸
• D) 10²⁹

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