Multiple Choice
The speed of H I gas clouds can be found using the
A) Doppler effect of radio signals.
B) 21-cm spin-flip transition.
C) temperature of the clouds.
D) mass of the clouds.
Correct Answer:
Verified
Correct Answer:
Verified
Related Questions
Q2: What causes the 21-cm radiation,and what is
Q3: The Milky Way,in which the Sun resides,is
Q4: What atomic transition occurs in atoms of
Q5: Harlow Shapley's original estimate of the distance
Q6: What fraction of the mass of our
Q7: We cannot see the precise shape of
Q8: In the halo of the Galaxy,there are
Q9: The spiral arm structure of the Milky
Q10: When we measure the narrow line emissions
Q11: If the galactic center is now thought