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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 2.4 cm. The number of oscillations in this length will be….. (Given $λ$ = 5900 $\overset{0}{A}$ )

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4.068 × 10⁴ Hz

4.068 × 10⁵ Hz

4.068 × 10⁶ Hz

4.068 × 10⁷ Hz

answer is A.

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Detailed Solution

Number of oscillations in coherence length

$n = \frac{l}{λ} = \frac{2.4 cm}{5900 x 10^{- 8} cm} = 4.068 x 10^{4}$

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