Under what conditions will a nova occur?
What will be an ideal response?
When a white dwarf pulls mass off its companion in a mass-transfer binary, and its hydrogen shell reaches 10 million K, sudden proton-proton fusion generates the bright flash and rapidly expanding envelope we observe from Earth.
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Spectra are often represented as graphs of:
A) distance versus luminosity. B) temperature versus density. C) intensity versus wavelength. D) brightness versus darkness.
What element makes up Io's thin atmosphere?
a. sulfur b. hydrogen c. helium d. carbon dioxide e. methane
Double-lobed radio galaxies appear to be emitting jets of gas and radiation
a. True b. False Indicate whether the statement is true or false
A ball drops some distance and loses 30 J of gravitational potential energy. Do NOT ignore air resistance. How much kinetic energy did the ball gain?
A) more than 30 J B) exactly 30 J C) less than 30 J