Mars has two moons, Phobos and Deimos, that are most similar in character to

A) small asteroids.
B) comets.
C) Earth's Moon.
D) particles in the rings of Saturn.


A) small asteroids.

Physics & Space Science

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Country X increases its population by 5% per year. How long will it be before its population doubles?

A) It is impossible to answer this without knowing country X's population. B) 20 years C) 35 years D) 10 years E) 14 years

Physics & Space Science

If a metal had a Fermi level (energy) of 5.0 eV, what would be the average energy of the electrons at 0 K?

A) 5.0 eV B) 3.0 eV C) 8.0 eV D) 6.0 eV E) 0.00 eV

Physics & Space Science

The mass number of an atom is equal to the number of what particles in the nucleus?

A) protons B) neutrons C) nucleons D) electrons E) positrons.

Physics & Space Science

Which of the following methods of decay does not result in an element different from that of the original parent nucleus?

a. alpha followed by negative beta followed by another negative beta b. alpha followed by beta c. alpha followed by gamma followed by another gamma d. alpha followed by positive beta followed by another positive beta

Physics & Space Science