Which of the following statements about Hawking radiation is not true, at least according to our current understanding?
A) It was first predicted by Stephen Hawking in the 1970s.
B) It causes black holes to slowly shrink in mass.
C) It has never yet been observed.
D) It represents a strange form of radiation that emerges from within the event horizon of a black hole.
E) It occurs when real particles are created from the gravitational potential energy of a black hole.
D
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How long is one Hubble time?
a. 1/4 the age of the Universe b. 1/2 the age of the Universe c. the age of the Universe d. double the age of the Universe
Which of the following objects is experiencing Earth's gravitational force?
A. a skydiver falling under the force of gravity B. an airplane taking-off C. a boat floating in water D. All of these choices are correct. E. Only an airplane taking-off and a skydiver falling under the force of gravity above.
Quarks are made up of subatomic particles, such as protons and electrons
Indicate whether the statement is true or false
A physicist claims that she has found a new particle with a mass 200 000 times the mass of the proton (1.67 × 10^?27 kg) and a charge of 3.20 × 10^?19 C. If she is correct, such a particle traveling in a circle in a uniform 5.00 T magnetic field at a velocity of 2 500 m/s will have a radius of
a. 0.261 m. b. 0.522 m. c. 1.04 m. d. 3.27 m. e. 3.13 × 10^26 m.