Some incandescent light bulbs are filled with argon gas. what is vrms (in m/s) for argon atoms near the filament, assuming their temperature is 2000 k?

The root mean square of the particles in a gas is given by

where
R is the gas constant
T is the absolute temperature of the gas
Mm is the molar mass of the gas

For the argon gas in our problem, the temperature is T=2000 K while the molar mass of argon is , so we can find the rms speed of the gas by using the previous formula:

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

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