A Sodium Vapor Lamp Has a Power Output of 60

question 4

Multiple Choice

A sodium vapor lamp has a power output of 60 W.If 547 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)10¹⁸
• B)10²⁰
• C)10³⁹
• D)10²⁹
• E)​10²⁸

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