Approximately how long did the nucleosynthesis era last?

A) 10-10 seconds
B) 5 years
C) 5 minutes
D) 0.001 seconds
E) 5 seconds

C

Physics & Space Science

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Shapley found the distance to the center of the galaxy by studying the distance to open clusters

a. True b. False Indicate whether the statement is true or false

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A moving cue ball strikes another ball of equal mass that is initially at rest on the flat planar surface of the pool table. If the collision is elastic, the direction of the velocity of the cue ball after the collision will be ________ to the direction of the velocity of the other ball.

What will be an ideal response?

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Physics & Space Science

Approximately what core temperature is required before hydrogen fusion can begin in a star?

A) 10 million K B) 10,000 K C) 10 trillion K D) 10 billion K E) 1 billion K

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Choose the true statement that compares and contrasts the Maxwell-Boltzmann (MB) distribution, the Fermi-Dirac (FD) distribution, and the Bose-Einstein (BE) distributions

a. The MB, FD, and BE statistical factors agree only at low particle energies. b. The MB distribution models only low-density material, while both the FD and BE distributions can model higher density material. c. The MB statistical factor goes to infinity at low particle energies, while the FD statistical factor goes to 1/2 and the BE statistical factor goes to 1. d. The MB and FD distributions work only for distinguishable particles while the BE distribution works for indistinguishable particles. e. The MB distribution works for particles with integer spin, the FD distribution works for particles with half-integer spin, and the BE distribution works for particles with any value of spin.

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Physics & Space Science