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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. | |