1.

If the frequency of emitted photon is 10 Hz, the ratio of Einstein s coefficient is _____________

A. 2.177 X 10<sup>-51</sup>
B. 3.177 X 10<sup>-51</sup>
C. 5.177 X 10<sup>-51</sup>
D. 6.177 X 10<sup>-51</sup>
Answer» E.


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