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The wavelength of wave of 5000 Å comir f...

The wavelength of wave of 5000 Å comir from a star at far distance is experience 5200 A, then what is the velocity ?

A

`1.2xx10^(7)cm//s`

B

`1.2xx10^(7)m//s`

C

`1.2xx10^(7)m//s`

D

`1.2km//s`

Text Solution

Verified by Experts

The correct Answer is:
B
Here `Deltalambda= lambda.-lambda`
`=5200-5000=200Å`
Now `(Delta lambda)/(lambda)=(v)/(c) rArr v=(c Delta lambda)/(v)=(3xx10^(8)xx200)/(5000)`
`:.v=1.2xx10^(7)m//s`
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