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Problem

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Textbook Expert
Textbook ExpertVerified Tutor
5 Dec 2021

Given information

Wavelength in laboratory gas  

Wavelength in spectrum of galaxy  

Step-by-step explanation

Step 1.

Expression of velocity in terms of wavelength and speed of light is given by

 

Also, from Hubble's law,

 

where

is the distance

is Hubble's constant.

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