Find coherence time , coherence length and frequency bandwidth for white light range 4×10^14Hz to 7.5×10^14Hz.
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Answer:
3.5x10^14Hz
Explanation:
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Two waves are coherent when there is no phase difference between them so there is a fixed relationship between both the waves .
The coherence length is given by
=λ / (2πΔλ)
Given λ = 4* Hz and Δλ = 3.5 * Hz
Thus we get , = 2π
= 8 * / 21.98
= 0.3639 *
= 36.39 * m
The coherence time is given by is =
=
=
= 12.13 * sec
The coherence length is = 36.39 * m and the coherence time is = 12.13 * sec
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