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A galaxy moving with speed 300km/s shows...

A galaxy moving with speed 300km/s shows blue shift. At what wavelength sodium line at 589.0 nm will be observed ?

Text Solution

Verified by Experts

Here `v_(radial)=-300km//s=-3 times 10^5 m//s`
Negative sign comes because we observe blue shift i.e galaxy is approaching us.
Now, `-(Delta lamda)/(589.0nm)=(-(3 times 10^5))/((3 times 10^8))`
`implies Delta lamda=-(589.0) times 10^-3 nm`
`=-0.589 nm`
Hence, the observed wavelength will be (589.0-0.589)nm=588.411 nm.
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