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1. |
If there are 'N' atoms in a source, each emitting light with intensity 'I', then the total intensity produced by an ordinary source is proportional to 'NI', whereas in a laser source, it is proportional to ________. |
A. | (NI)2 |
B. | 2NI |
C. | NI2 |
D. | N2I |
Answer» E. | |