The main source of energy for a star as it grows in size to become a red giant is
A) hydrogen fusion in the central core.
B) helium fusion in the central core.
C) hydrogen fusion in a shell surrounding the central core.
D) gravitational contraction.
C
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What kinds of objects lie in the halo of our galaxy?
A) open clusters B) O and B stars C) globular clusters D) gas and dust E) all of the above
____ is absorbed by ozone in Earth's atmosphere that is located between 20 km and 40 km above Earth's surface. Therefore, telescopes to observe this radiation must be placed in space
a. Infrared radiation b. Ultraviolet radiation c. Radio wave radiation d. X-ray radiation e. Visible light
Which of the following is NOT a property of a pulsar?
A) period of 1.34 seconds B) over time, the period is gradually increasing C) emissions only in the visible part of the spectrum D) each pulse consisting of a 0.01 second burst of radiation E) time interval between pulses is very uniform
The energy level diagram for hydrogen
The ionization energy of hydrogen is
a.
1.5 eV.
b.
1.9 eV.
c.
3.4 eV.
d.
10.2 eV.
e.
13.6 eV.