Physics Unit27: Early Quantum Theory and Models of the Atom (id: ac1bd950b)

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本题目来源于试卷: Physics Unit27: Early Quantum Theory and Models of the Atom，类别为 Generic Physics

[单选题]
At what rate are photons emitted by a 50-W sodium vapor la+t;wu 1s ajjz,mpakbop xkoz*f k:81k(-? (Assume that the lamp's light is monochromatic and of waveleno-zk kx8*pk(oa:1 k bfgth $589 \; nm$.)

A. $1.0 \times 10^{20}/$s
B. $1.5 \times 10^{20}/$s
C. $2.0 \times 10^{20}/$s
D. $2.5 \times 10^{20}/$s


参考答案:  B


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