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The star recedes from the earth at the speed a 100 kms^(-1) Find the doppler shift of spectrur line 3xx 10^(8)ms^(-1) ms having wavelength 5700Å |
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Answer» `0.63Å` `(Deltaf)/(FS)=(v_(s))/(c) ....(1) and f=(c)/(lambda)` Taking derivative w.r.t. `lambda` PUTTING `Deltaf=(-c)/(lambda^(2))Delta and f_(s)=(c)/(lambda)` `:.` From equation (1) `(c)/(lambda^(2)xx(c)/(lambda)) delta lambda=(v_(s))/(c)` `:. delta lambda=(v_(s))/(c)xxlambda` `=(100xx10^(3)xx 5.7xx10^(-7))/(3XX10^(8))` `=1.90Å` |
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