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 emi.jh vifv x20*utte wmkr16ufkkw a 58dq+j 10k.qdd by a 50-W sodium vapor lamp? (Assume that the lamp's light is monochromatic and of wak8w1wjkf6duk5+krmqd01 .a qvelength $589 \; nm$.)

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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