A cubic box with sides of 20 cm contains 2 × 1023 molecules of helium with a root-mean-square (rms) speed of 200 m/s. The mass of a helium molecule is 3.4 × 10-27 kg
What is the average pressure exerted by the molecules on the walls of the container? A) 3.39 kPa
B) 1.13 kPa
C) 570 Pa
D) 2.26 kPa
E) 9.1 Pa
B
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The temperature inside an H II region is colder than inside an H I region
Indicate whether the statement is true or false
It's cold! You are sitting on what appears to be an ice-covered world (water ice). The Sun is low on the horizon and circles the horizon about once every 24 hours
Despite the low Sun, you can almost "feel" the skin cancers appearing on your exposed face (because there is little ozone to protect you). Despite these discomforts, you are pleased to find that the air is quite satisfactory; oxygen seems plentiful, and you are able to breathe even without the life-support belt.
When a tube of diameter d is placed in water, the water rises to a height h. If the diameter were half as great, how high would the water rise?
A) 4h B) h/2 C) 2h D) h/4 E) h
Two coherent light sources are characterized by
A) having the same amplitude. B) having the same frequency. C) having the same wavelength. D) having the same velocity. E) having the same frequency and maintaining a constant phase difference.