Author Question: The root-mean-square speed (thermal speed) of the molecules of a gas is 200 m/s at 23.0C. At 227C ... (Read 126 times)

shenderson6 · **on:** Jul 29, 2018

The root-mean-square speed (thermal speed) of the molecules of a gas is 200 m/s at 23.0C. At 227C the root-mean-square speed (thermal speed) of the molecules will be closest to

A) 260 m/s B) 630 m/s C) 330 m/s D) 160 m/s E) 2000 m/s

Question 2

A 35 mm camera equipped with a 40 mm focal length lens is used to photograph a tree 17 m tall. The aperture of the lens is set at f/8. A 32 mm high image of the tree on the film is required.

The required distance, between the tree and the camera, to take the photograph is closest to: A) 21 m
B) 22 m
C) 23 m
D) 24 m
E) 26 m