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Q.

The wave emitted by any atom or molecule must have some finite total length which is known as the coherence length. For sodium light, this length is 3.6cm. The coherence  time will be

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a

1.2×10−11sec

b

1.2×10−12sec

c

12×10−11sec

d

1.2×10−8sec

answer is C.

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Detailed Solution

Coherence time=coherence lengthvelocity  of  light=3.6×10−23×108=1.2×10−10=12×10−11sec
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