The wavelength of light in air 5000 A.U. The number of waves in 50 cm of air is
A. `10^(5)` waves
B. `10^(6) ` waves
C. `5xx10^(5)` waves
D. `0.5xx10^(6)` waves

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Correct Answer - B
`n=( 50 xx 10^(-1))/( 50 xx 10^(-7))=10^(6)` .

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