In contrasting the distribution of the X-ray and gamma-ray bursts, we find:
A) gamma ray bursts are far closer to us, so they appear more luminous.
B) gamma ray bursts are far beyond our Galaxy, at cosmological distances, and spread all over the sky, not in the plane of our Galaxy.
C) gamma ray bursts are more closely associated with open than globular clusters.
D) gamma ray bursts can repeat, while the X-ray bursts do not.
E) gamma ray bursts can be observed from the ground, but X-rays are blocked by the ionosphere for ground based observers.
B
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The Dirac theory predicted that a positron would be
a. a negative electron in a negative energy state. b. a particle with same mass as an electron but with opposite charge. c. a particle with negative mass. d. All of the above.
Imagine that you visit an alien world that has an atmospheric composition similar to that of Earth (that is, mostly nitrogen and oxygen) and a surface atmospheric pressure of 1.2 bars. Which of the following statements best describes the effects of this pressure?
a. It will feel quite similar to the atmospheric pressure on Earth. b. It will feel about like the pressure on a high mountaintop on Earth. c. It will feel crushing, like being deep under the ocean. d. It is so low that you'll need to wear a pressurized spacesuit to survive.
A(n) ______________is denser than a neutron star
Fill in the blank(s) with correct word
In a nuclear reaction, what value is conserved in addition to electric charge, energy, and momentum?
A) atomic number B) neutron number C) nucleon number D) all of the given answers E) none of the given answers