
Concept explainers
(a)
The recessional velocity of the RD1 galaxy.

Answer to Problem 30Q
Explanation of Solution
Given:
The redshift
Formula Used:
Where,
Calculation:
Conclusion:
Therefore, the recessional velocity of the RD1 galaxy is
(b)
The recessional velocity of the RD1 galaxy, if erroneously used the low-speed formula for the calculation and whether it is a large error or not.

Answer to Problem 30Q
The recessional speed obtained of the galaxy using the low-speed formula is
Explanation of Solution
Given data:
The recessional speed of the galaxy is
Formula used:
The recessional velocity of a galaxy can be found by using the formula (however valid for low speeds only),
Where,
Calculation:
From the calculation, the recessional velocity can be obtained as
Conclusion:
The recessional speed obtained of the galaxy using the low-speed formula is
(c)
The distance from the Earth to the galaxy RD1 according to the Hubble law.

Answer to Problem 30Q
The distance from the Earth to the galaxy RD1 according to the Hubble law is
Explanation of Solution
Given data:
Hubble constant
Formula used:
Hubble law can be interpreted as
Where,
Calculation:
Rearranging the formula,
Conclusion:
Therefore, the distance from the Earth to the galaxy RD1 according to the Hubble law is
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Chapter 23 Solutions
Universe: Stars And Galaxies
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