Which photo shows what we call a gibbous moon? (Note: Assume these photos were taken in the Northern Hemisphere.)

A) 1
B) 2
C) 3
D) 4

C) 3

Physics & Space Science

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What would happen if a white dwarf gained enough mass to reach the 1.4 solar-mass white dwarf limit?

A) The white dwarf would explode completely as a white dwarf supernova. B) The white dwarf would collapse in size, becoming a neutron star. C) The white dwarf would undergo a nova explosion. D) The white dwarf would collapse to become a black hole.

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Physics & Space Science

A fragment of a collapsing gas cloud that comes to equilibrium with a central temperature of 4 million K will become a:

A) black hole. B) brown dwarf. C) black dwarf. D) T Tauri star. E) stage 1 protostar.

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Physics & Space Science

There are several elements that we regard as semiconductors. The common property of these elements is that they have

A. outer electrons which cannot move. B. electrons, which are randomly organized about the nucleus. C. no electrons beyond a closed shell. D. four outer electrons beyond a closed shell.

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Physics & Space Science

A particle moves along the x-axis in the positive direction with energy E. It encounters a barrier with potential V > E at x = 0 and extending to x = L. Is there any chance for the particle make it to the other side?

a. Yes. The wave functions allow for a small probability for the particle to pass through the barrier. b. Yes, but only if the particle increases in energy so that E > V.

c. Yes. The particle will pass by unaffected in both classical and quantum mechanical consideration. d. No. An incoming particle would have negative kinetic energy within the potential barrier. e. No. The particle will transmit some energy but the particle will always reflect off the barrier.

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Physics & Space Science