The wave of wavelength `5900 Å` emitted by any atom or molecule must have some finite total length which known as coherence length. For sodium light, this length is `2.4cm`. The number of oscillation in this length will be,

Options

A. `4.068 xx 10^(8)`
B. `4.068 xx 10^(4)`
C. `4.068 xx 10^(6)`
D. `4.068 xx 10^(5)`

Answer

B

Explanation

Number of oscillations in coherence length
`(l)/(lambda)= (0.024)/(5900 xx 10^(-10))= 4.068 xx 10^(4)`