Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 3200 K?
a. There is no hydrogen in stars this cool.
b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy.
c. These stars are so cool that nearly all of the electrons in the hydrogen atom are in the ground state.
d. Stars of this temperature are too cool to produce an absorption spectrum.
e. Stars of this temperature are too hot to produce an absorption spectrum.
C
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Gravitational Force: At their closest approach, Venus and Earth are 4.20 × 1010 m apart. The mass of Venus is 4.87 × 1024 kg, the mass of Earth is 5.97 × 1024 kg, and G = 6.67 × 10-11 N ? m2/kg2. What is the magnitude of the gravitational force exerted by Venus on Earth at that point?
A. 1.10 × 1018 N B. 4.62 × 1028 N C. 5.43 × 1026 N D. 6.30 × 1020 N E. 1.72 × 1019 N
The angular measurement in hours, minutes, and seconds from the celestial prime meridian eastward is called _______________
a. sundial b. protractor c. declination d. right ascension
The rings of Uranus were discovered during a(n) _______________ when Uranus crossed in front of a star
Fill in the blank(s) with correct word
What does the moderator do in a nuclear reactor?
a. It is a safety feature that limits the nuclear reaction. b. It absorbs neutrons. c. It slows down neutrons. d. none of the above