PHY101 Quiz.4

Two metal strips that constitute a thermostat must necessarily differ in their:
a) mass
b) length
c) resistivity
d) coefficient of linear expansion

In a photoelectric effect experiment at a frequency above cut off, the stopping potential is proportional to 

A. the energy of the least energetic electron before it is ejected
B. the energy of the least energetic electron after it is ejected
C. the energy of the most energetic electron before it is ejected
D. the energy of the most energetic electron after it is ejected