The maximum mass for a white dwarf is 1.4 solar masses. ...

[Zoey63294]

The maximum mass for a white dwarf is 1.4 solar masses.
 
  Indicate whether the statement is true or false

Question 2

Briefly explain how we can use spectral lines to determine an object's radial motion (toward or away from us). Can we also learn the object's tangential motion (across our line of sight) from its spectral lines?
 
  What will be an ideal response?

[nital]

Answer to Question 1

TRUE

Answer to Question 2

By comparing the wavelength of the spectral lines in the object's spectrum to the rest wavelengths of the same lines, we measure the Doppler shift. This tells us the object's radial motion: A shift toward shorter wavelength means the object is moving toward us, and a shift to longer wavelength means it is moving away from us. We cannot learn anything about the object's tangential motion from its spectral lines because this does not affect the line positions.

[Zoey63294]

Both answers were spot on, thank you once again

[nital]

Great! Please up vote