What is the origin of synchrotron radiation in radio galaxies?
A. neutron stars at the center of the radio galaxy
B. supernova explosions
C. radiation from a massive black hole at the center of the galaxy
D. high-speed electrons spiraling around the magnetic field lines
E. hydrogen gas
Answer: D
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The first living organisms probably resembled
A) single-celled eukaryotes B) multicellular eukaryotes C) single-celled prokaryotes D) multicellular prokaryotes
A radioactive substance containing 4.0 × 1016 unstable atoms has a half-life of 2.0 days. What is its activity (in curies, Ci) after 1.0 day? (1 Ci = 3.70 × 1010 Bq)
What will be an ideal response?
Our Sun will eventually become a red giant, then expel a(n) ________ and collapse into a white dwarf
Fill in the blank(s) with correct word
You toss a ball to a friend. When the ball reaches its maximum altitude, its acceleration
A) changes sign. B) is zero. C) is constant. D) is g/2. E) is 2*g.