Question

the coherence length of a laser beam for which the frequency bandwidth is 3000Hz​

Answer 1

• Frequency=v=3000Hz
• Wavelength=$\lambda$=?

We know

$\boxed{\sf \lambda=\dfrac{C}{v}}$

$\\ \sf\longmapsto \lambda=\dfrac{3\times 10^8ms^{-1}}{3000s^{-1}}$

$\\ \sf\longmapsto \lambda=0.001\times 10^8m$

$\\ \sf\longmapsto \lambda=1\times 10^{5}m$