In hychrogen speactrun the wavelength of `H_(a)` line is `656nm, ` where in the spactrum of a distance galaxy `H_(a)` line wavwlength is `706 nm` . Estimated speed of the galaxy with respact to each is ,
A
`2 xx 10^(8) m//s`
B
`2 xx 10^(7) m//s`
C
`2 xx 10^(6) m//s`
D
`2 xx 10^(5) m//s`
Text Solution
Verified by Experts
The correct Answer is:
B
KEY CONCEPT: According to Doppler's effect of ligth, the wavelength shift is given by `delta lambda = (nu)/(c ) xx lambda` `rArr nu = (delta lambda xx c)/(lambda) = ((706 - 656))/(656) xx 3 xx 10^(8) oo 2 xx 10^(7)m//s`
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