The sources of both X-rays and gamma rays are
A) electron clouds.
B) the atomic nucleus.
C) both of these
D) neither of these
Answer: D
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Which of the following is not true about differences between novae and supernovae?
A) The same star can undergo novae explosions more than once, but can undergo only a single supernova. B) Supernovae eject gas into space, but novae do not. C) Novae occur only in binary star systems, while supernovae can occur both among single stars and among binary star systems. D) Novae are much less luminous than supernovae.
The remnant left behind by a white-dwarf supernova is a neutron star
Indicate whether the statement is true or false
The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by 
in SI units. What is the frequency of the wave?
A. 500 MHz B. 250 kHz C. 1.25 MHz D. 10 mHz E. 300 MHz