According to the Zeeman effect, the splitting of a sunspot's spectral lines is due to
A) their magnetic fields.
B) a Doppler shift.
C) temperature variations.
D) their rapid rotation.
E) their radial velocity.
A
You might also like to view...
Stored potatoes, beets, and rutabagas freeze at temperatures below zero degrees Celsius (rather than at exactly zero) because
A) they are good radiators of energy. B) they are good absorbers of radiant energy. C) the water in them contains dissolved salts and sugars. D) they are relatively dense. E) all of the above
Our molten core is believed to consist primarily of the element ________
Fill in the blank(s) with correct word
Fission is used in
a. atomic bombs b. power plants c. energy for stars d. hydrogen bombs e. a tokamak reactor
A ball is thrown downward from the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high is the building, assuming negligible air resistance?
A) 20 m B) 30 m C) 50 m D) 70 m