Based on current evidence, which of the following statements about gamma ray bursts is true?
A) They occur in the same types of close binary systems that produce X-ray bursts.
B) All those that we have detected occurred in distant galaxies.
C) They come primarily from the Milky Way's central black hole.
D) All gamma ray bursts are produced by supernovae.
B
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The ________ magnitude of a star depends directly upon its luminosity and distance
Fill in the blank(s) with correct word
A deuteron, with the same charge but twice the mass of a proton, moves with a speed of 6.00 × 10^5 m/s perpendicular to a uniform magnetic field of 0.0525 T. Which of the paths described below would it follow? (qp = 1.60 × 10^?19 C and md = 3.34 × 10^?27 kg)
a. a straight-line path b. a circular path of 61.1 cm radius c. a circular path of 23.9 cm radius d. a circular path of 2.14 cm radius e. a circular path of 1.70 cm radius
The reaction rate of a chemical reaction doubles when the temperature increases from 10
to 50
What is the activation energy?
a. 
b. 
c. 
d. 
e. 
The Cosmological Principle states that
A. the Universe began as a hot violent event. B. the expansion of the Universe is speeding up. C. there is not a preferred location in the Universe. D. the laws of physics apply everywhere in the Universe. E. the Universe will continue to expand forever.