Suppose the laboratory wavelength of a spectral line is 600 nm. ...

[tfester]

Suppose the laboratory wavelength of a spectral line is 600 nm. In a star it is measured to be 599.4 nm. Is the star moving toward or away from us, relative to the line of sight? How fast is it moving? (Hint: c = 300,000 km/s)
 
  a. toward; 300 km/s
  b. away; 300 km/s
  c. at rest; 0 km/s
  d. sideways; 300 km/s
  e. toward; 150 km/s

Question 2

The Sun traces a path along the ecliptic in a period that is longer than 365 days.
 
  a. True
  b. False
  Indicate whether the statement is true or false

[Silverbeard98]

Answer to Question 1

a

Answer to Question 2

True

[tfester]

Thanks

[Silverbeard98]

Welcome