One theory for the origin of life suggests that life was transported to Earth in meteorites. This is referred to as

A) naturism
B) intelligent design
C) panspermia
D) chemical evolution

C

Physics & Space Science

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An electron in a cathode ray tube is accelerated through a potential difference of 10 kV. What kinetic energy does the electron gain in the process? (e = 1.6 × 10^-19 C)

a. 8.0 × 10^-16 J c. 8.0 × 10^22 J b. 1.6 × 10^-15 J d. 1.6 × 10^-16 J

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Physics & Space Science

When a photon collides with a free electron at rest and the direction of motion of the photon changes,

a. the magnitude of the momentum of the photon does not change. b. the momentum of the electron does not change. c. the kinetic energy of the electron does not change. d. the total energy of the photon does not change. e. both the magnitude of the momentum and the total energy of the photon decrease.

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Physics & Space Science

What is the Fermi energy?

a.At temperatures approaching T = 0, the energy of the level at which the most energetic fermion lies. b.The lowest energy that an electron in an atom will be likely to occupy.

c. The mean electronic energy of a conductor at T = 0. d. The energy associated with the mean speed of a molecule of an ideal gas, dependent on T.

e. The amount of energy transferred to the water when the weight dropped 1 m in Joule's famous thermodynamic experiment.

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Physics & Space Science

What is the magnitude of the momentum of a proton moving at 0.95 c?

A.
B.
C.
D.
E.

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Physics & Space Science