Stars in the upper right part of the Hertzsprung-Russell diagram are always ____ when compared to stars near the middle of the diagram
a. cooler
b. brighter as seen from Earth
c. larger
d. smaller
e. more massive
c
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By approximately _________ years ago, _________ had produced oxygen in enough amounts to be a significant fraction in Earth's atmosphere.
a. 100 million; trees and plants b. 1 billion; trees and plants c. 250 million; bacteria and algae d. 2.5 billion; bacteria and algae e. 2,000; animals and humans
A sinusoidal wave’s angular frequency is (A) larger, (B) smaller, or (C) the same as its frequency in cycles/s.
A. Large B. Smaller C. The same as its frequency in cycles/s.
How did Ptolemy explain the retrograde motion of Venus?
What will be an ideal response?
If h = Planck's constant, the frequency of light emitted when an atom makes a transition is equal to
A. the energy lost by the electron divided by h. B. the energy of revolution of the electron in its lowest energy orbit divided by h. C. the energy gained by the electron divided by h. D. the energy of revolution of the electron in its highest energy orbit divided by h.