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

[单选题]
At what rate are photons1z-c sj-cz741dk mxfgns8py8 emitted by a 50-W sodium v+cfvkm te3g.k s 0sw6a4d +/ikapor lamp? (Assume that the lamp's light is monochromatic and o tkwgd30mke a/4+c6+sk fiv s.f wavelength $589 \; nm$.)

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


本题详细解析: 暂无