If the wavelength of light is 4000 , Å, then | vedclass

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(B) The number of waves $n$ in a given length $L$ is calculated by the formula $n = \frac{L}{\lambda}$.Given, length $L = 1 \, mm = 10^{-3} \, m$.Wave

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$2500$

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(B) The number of waves $n$ in a given length $L$ is calculated by the formula $n = \frac{L}{\lambda}$.Given, length $L = 1 \, mm = 10^{-3} \, m$.Wavelength $\lambda = 4000 \, Å = 4000 	imes 10^{-10} \, m = 4 	imes 10^{-7} \, m$.Substituting these values into the formula:$n = \frac{10^{-3}}{4 	imes 10^{-7}} = \frac{1}{4} 	imes 10^{4} = 0.25 	imes 10000 = 2500$.Therefore, the number of waves is $2500$.

If the wavelength of light is $4000 \, Å$, then the number of waves in a length of $1 \, mm$ will be:

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