Author Question: A laboratory vacuum pump can reduce the pressure in a chamber to 1.0 10-7 Pa. If the volume of the ... (Read 60 times)

joesmith1212 · **on:** Jul 29, 2018

A laboratory vacuum pump can reduce the pressure in a chamber to 1.0 10-7 Pa. If the volume of the chamber is 0.500 m3 and the temperature is 27C, how many molecules are left inside the chamber? (NA = 6.022 1023 molecules/mol, R = 8.

31 J/mol K) A) 1.2 1013
B) 2.4 1013
C) 1.2 1012
D) 2.4 1012
E) 1.2 1014

Question 2

An x-ray tube accelerates electrons through a potential difference of 50.0 kV. If an electron in the beam suddenly give up its energy in a collision,

what is the shortest wavelength x-ray it could produce? (c = 3.00 108 m/s, h = 6.626 10-34 J s, e = 1.60 10-19 C)