1.

A rocket goes away from Earth at speed of 6 xx 10^(7) m//s and it has blue light in it, what will be the wavelength of light observed by observer at Earth? Wavelength of blue ligth =4600 Å

Answer»

`4600Å`
`5520Å`
`3860Å`
`3920Å`

SOLUTION :`(Delta lambda)/(lambda)=(v)/(c)=(6XX10^(7))/(3xx10^(8))=0.2`
`:. Deltalambda= lambda.-lambda`
`:. lambda.=1.2 lambda`
`=1.2xx4600Å`
`:. Lambda.=5520Å`


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