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Author Question: What is the significance of the Tully-Fisher relation? ... (Read 63 times)

rosent76

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on: Jul 28, 2018
What is the significance of the Tully-Fisher relation?

Question 2

What happens to the magnitude of the magnetic field inside a long solenoid if the radius is doubled?
  1.It becomes four times larger.
  2.It becomes twice as large.
  3.It is unchanged.
  4.It becomes one-half as large.
  5.It becomes one-fourth as large.


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raenoj

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Reply #1 on: Jul 28, 2018
Answer to Question 1

The Tully-Fisher relation gives astronomers another direct measurement tool for
determining the absolute magnitude of a spiral galaxy using the width of H2 lines in
the light spectrum that is independent of the radial motion measurements made using
red-shifts.

Answer to Question 2

3


rosent76

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Reply 2 on: Jul 28, 2018
Thanks for the timely response, appreciate it

T4T

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Reply 3 on: Yesterday
Excellent

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