Why are eclipsing binaries the rarest of the three types discussed?
What will be an ideal response?
Only if we are lucky will we see their orbits edge-on, and the disks of the two stars actually cover each other. Visual and spectroscopic binaries are seen at a host of orbital inclinations.
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What layer of the Sun are we seeing in this photograph, and in what wavelength band was it photographed?
A) corona, photographed in x-rays B) chromosphere, photographed in visible light C) photosphere, photographed in visible light D) convection zone, photographed in infrared light E) radiation zone, photographed in x-rays
How do we know that there is an insignificant amount of dark matter in the solar system?
What will be an ideal response?
While the gondola is rising at a speed of 2.0 m/s, a passenger in a balloon-supported gondola throws a small ball down at a speed of 5.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
A. 2.0 m/s, up. B. 3.0 m/s, down. C. 3.0 m/s, up. D. 5.0 m/s, down. E. 12.8 m/s, down.
For an atom to be neutral, it must have the same number of:
a. electrons and neutrons b. electrons and protons c. neutrons and protons d. neutrons only e. electrons, neutrons, and protons