Which of the following systems is most likely to contain a black hole?
A) an x-ray binary in which the unseen companion has a mass 2 MSun
B) an x-ray binary in which the unseen companion has a mass 10 MSun
C) an x-ray binary that undergoes frequent x-ray bursts
D) a binary system in which novae have been observed to occur
E) a system that has recently undergone a white dwarf supernova
B) an x-ray binary in which the unseen companion has a mass 10 MSun
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We can determine the surface temperature of a star from
a. studying its continuous spectrum. b. studying its line absorption spectrum. c. measuring the star's luminosity. d. studying its continuous spectrum and measuring the star's luminosity. e. studying its continuous spectrum, studying its line absorption spectrum, and measuring the star's luminosity.
How much cooler is the universe now (at an age of 4 × 1017 s) than it was at an age of 1 second?
A) Its current temperature is one hundred-millionth (10-8) the temperature at an age of 1 second. B) Its current temperature is one hundred-thousandth (10-5) the temperature at an age of 1 second. C) Its current temperature is one-hundredth (10-2) the temperature at an age of 1 second. D) Its current temperature is one ten-billionth (10-10) the temperature at an age of 1 second.
If the Hubble Constant is 70 km/sec/Mpc, the accelerating universe is about 10 billion years old
Indicate whether the statement is true or false
The span of time required for the radioactive decay of half the parent nuclei in a sample is known as the ______________
Fill in the blank(s) with correct word