Does Ohm's Law Apply to a Semiconductor?
Investigation
Online Resources  Investigation  Assessment
Look at some of the test results and try to determine the following:
 Do silicon semiconductors obey Ohm's Law in general? Do they sometimes obey Ohm's Law? Exactly? Approximately?
 How does neutron radiation affect the resistance of a silicon strip?
 Can you construct a graph and/or an equation to show the resistance R of a silicon strip as a function of the number of neutrons N incident upon that strip?
 Why do you think neutron radiation affects the resistance of a silicon strip? How could your hypothesis be tested?
Find the data you need in the graph below:
Explanation of the data:
The number of incident neutrons on this detector varies, in approximately equal increments, from 0 at 13:49 on 8/10/99 to 13.9 x 1014 neutrons at the conclusion of the data run at 14:23 on 8/11/99. Thus the neutron bombardment for each run is given in the table below.
Date

Time

Neutrons Incident

8/10/99

13:49

0

8/10/99

20:25

3.5 x 10^{14}

8/11/99

2:17

7.0 x 10^{14}

8/11/99

8:20

10.4 x 10^{14}

8/11/99

14:23

13.9 x 10^{14}
