What is the significance of the Planck time?
A) It is the amount of time required for two protons to fuse to make deuterium.
B) It is the time at which inflation is thought to have occurred.
C) It is the time when the cosmic microwave background was released.
D) Before it, conditions were so extreme that our current understanding of physics is insufficient to predict what might have occurred.
D
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How do the jovian planet interiors differ?
A) All have about the same amount of hydrogen and helium but the proportion of rocks is greater in those planets closer to the Sun. B) All have cores of about the same mass, but differ in the amount of surrounding hydrogen and helium. C) The composition changes from mostly ammonia in Jupiter and Saturn to mostly methane in Uranus and Neptune. D) The composition changes from mostly hydrogen in Jupiter and Saturn to mostly helium in Uranus and Neptune. E) The core mass decreases with the mass of the planet.
A segment of wire of total length 2.0 m is formed into a circular loop having 5.0 turns. If the wire carries a 1.2-A current, determine the magnitude of the magnetic field at the center of the loop.
A. 79 ?T B. 69 ?T C. 59 ?T D. 89 ?T E. 9.4 ?T
What is meant by separation point?
What will be an ideal response?
Bok globules are small, dark fragments of the interstellar medium
a. True b. False Indicate whether the statement is true or false