The most harmful radiations are those that
A) kill living cells.
B) damage living cells.
C) don't encounter cells.
Answer: B
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Consider a planet orbiting a Sun-like star that has been detected by the Doppler and that has an orbital period of one year. The larger the velocity changes measured for the star, the
A) larger the mass of the planet. B) larger the radius of the planet. C) smaller the mass of the planet. D) smaller the radius of the planet.
According to the law of poles, like poles ______________
Fill in the blank(s) with correct word
The total amount of power (in watts, for example) that a star radiates into space is called its ________
A) apparent brightness B) flux C) absolute magnitude D) luminosity
Which of the following correctly describes the relationship between Newton's theory of gravity and general relativity?
A) Newton's theory of gravity is now known to be false, and we were previously misled to think it was true by measurement errors. B) Newton's theory of gravity and general relativity give the same answers, but the former tells us to think of gravity as a force and the latter tells us to think of gravity as curvature of spacetime. C) Newton's theory of gravity is an approximation to general relativity that works when gravity is relatively weak, but breaks down when gravity is strong. D) General relativity applies at the sub-atomic level, but Newton's theory of gravity does not.