A jar filled with gas is placed directly in front of a second jar filled with gas. Using a spectroscope to look at one jar through the other you observe dark spectral lines. The jar closest to you contains
A) gas at the same temperature as the other jar.
B) the hotter gas.
C) gas at very high pressure.
D) the cooler gas.
E) the exact same gas as the other jar.
D
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Star 1 on the MS has T = 10000 K & star 2 on the MS has T = 3000 K. How do their sizes compare?
A: star 2 is 3 times bigger than star 1 B: star 1 is 3 times bigger than star 2 C: star 2 is 30 times bigger than star 1 D: star 1 is 30 times bigger than star 2 E: either star could be bigger
If during a given physical process the only force acting on an object is friction, which of the following must be assumed in regard to the object's kinetic energy?
a. decreases c. remains constant b. increases d. cannot tell from the information given
The recombination era of the big bang was very important in several ways. Explain what happened during this time and what observable effects of the era existed
What will be an ideal response?
What is the value of n in the Balmer series for which the wavelength is 410.2 nm?
A) 4 B) 5 C) 6 D) 7 E) 9