Author Question: A cubic box with sides of 20 cm contains 2 1023 molecules of helium with a root-mean-square (rms) ... (Read 39 times)

Arii_bell · **on:** Jul 27, 2018

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

Question 2

The velocity of propagation of a transverse wave on a 2.0 m long string fixed at both ends is 200. m/s. Which one of the following is not a resonant frequency of this string?

A) 50 Hz
B) 200 Hz
C) 25 Hz
D) 100 Hz