Generally speaking, a main-sequence star is ________ than it was during the time it was a protostar
A) hotter and dimmer
B) hotter and brighter
C) cooler and dimmer
D) cooler and brighter
A) hotter and dimmer
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The observed composition of ordinary matter in the universe—roughly 75 percent hydrogen and 25 percent helium—closely matches theoretical predictions based on the Big Bang model
Indicate whether the statement is true or false
The globular star clusters are the most obvious examples of Population II around us
Indicate whether the statement is true or false
A cube-shaped box is sitting on the floor. The pressure the box exerts on the floor is 235 Pa. If the density of the box is 21.0 kg/m3, what is the length of each side of the box?
a. 0.00910 m b. 1.14 m c. 110 m d. 11.2 m
When electrons are placed in a magnetic field, their spin orientations are quantized. How many orientations with respect to the field may result?
a. 1 c. 3 b. 2 d. 4 or more