The Balmer lines correspond to wavelengths in the ________ part of the spectrum of a(n) ________ atom.
A. X-ray; helium
B. ultraviolet; helium
C. visible; hydrogen
D. infrared; hydrogen
Answer: C
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If the Hubble Constant is 70 km/sec/Mpc, the accelerating universe is about 10 billion years old
Indicate whether the statement is true or false
A person looking through eyeglasses sees __________ images
Fill in the blank(s) with correct word
Star #1 is approaching the Earth with speed v. Star #2 is receding from the Earth with the same speed v. Measurements of the same spectral line from each of the stars show Doppler shifts in frequency. The light from which star will have the larger magnitude shift in frequency?
a. star #1 b. Both stars will have the same shift. c. The value of the speed must be known before an answer can be found. d. star #2
The traditional theory states that the galaxy formed
a. as a large spherical cloud of gas that was rotating very slowly. b. from a large cloud of material that broke off a larger galaxy. c. from material that had been ejected in the violent explosion of a dying galaxy. d. as a result of mergers between several smaller groups of gas, dust, and stars. e. as two massive galaxies collided.