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The wave number of two waves are 2.5 xx ...

The wave number of two waves are `2.5 xx 10^(6)` / metre and `2 xx 10^(6)` / metre . What is the difference between their wavelength ?

A

5000 Å

B

4000 Å

C

2000 Å

D

1000 Å

Text Solution

Verified by Experts

The correct Answer is:
D
Wavelength = `(1)/("Wave number")`
`therefore lambda_(1) = (1)/(2.5 xx 10^(6)) = 4 xx 10^(-7)` m and `lambda_(2) = (1)/( 2 xx 10^(-7)) m `
` therefore lambda_(2) - lambda_(1) = 10^(-7) m = 10^(-7) xx 10^(10) = 10^(3)` Å
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