1.

A star emitting light of 5000 Å is receding away from earth with a velocity of 300 km/s. the apparent wavelength of light is :

Answer»

5000Å
5005 Å
5050 Å
4096 Å

Solution :`Delta LAMBDA = (u lambda)/(C ) = (5000 xx 3XX 10^(5))/(3 xx 10^(8)) `
`Delta lambda = 5 `Å
`therefore lambda. - lambda rArr lambda = 5000 + 5 `Å.
Hence the correct choice is (B) .


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