How do scientists estimate the age of the Solar System?

A. They measure the heat content of the planets.
B. They measure the ratios of radioactive elements in rocks.
C. They count the number of craters on the Moon and Mercury.
D. They compare the weathering of rocks on Earth with lunar rocks.
E. None of these choices are correct.


Answer: B

Physics & Space Science

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A satellite of mass M takes time T to orbit a planet. If the satellite had twice as much mass, the time for it to orbit the planet at the same altitude would be

A) 4T. B) 2T. C) T. D) T/2. E) T/4.

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What is the symbol traditionally used to represent wavelength?

a. wl b. y c. ? d. ?

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The smallest kinetic energy that an electron in a box (an infinite well) can have is zero

A) True B) False

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If a quantity is conserved, it means that it

Choose one: A. can be saved for a later time. B. changes only if an external force acts. C. changes only if an internal force acts. D. it doesn't change.

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