A Light-Emitting Diode Has a Power Output of 0

question 2

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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