What are cosmic rays?
A) subatomic particles that travel close the speed of light
B) another name for gamma rays and x-rays
C) fast moving dust particles in the interstellar medium
D) the highest-energy form of light
E) lasers used as weapons by extraterrestrials
A) subatomic particles that travel close the speed of light
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Which of the following are the best candidates to search for planets that might harbor extraterrestrial life?
A) low mass stars (less than one-tenth of the mass of the Sun), because these are the most common stars in our galaxy B) solar-mass stars, because they have both a large habitable zone and a long stellar lifetime. C) massive stars (greater than twice the mass of the Sun) because they provide more energy to promote biology D) halo stars, because planets can form in isolation from disruptive stellar encounters E) binary stars, because they provide twice as much energy to promote biology
The wave function for a particle must be normalizable because
A) the particle's momentum must be conserved. B) the particle's angular momentum must be conserved. C) the particle's charge must be conserved. D) the particle must be somewhere. E) the particle cannot be in two places at the same time.
If the momentum of an object is tripled, its kinetic energy will change by what factor?
a. zero b. one-third c. three d. nine
The astrology practiced by those who cast predictive horoscopes can be tested by
A) comparing how often the predictions come true to what would be expected by pure chance. B) asking astrologers if it works. C) polling people to find out what percentage believe their horoscopes to be accurate. D) counting how many times the predictions come true.