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### College Physics (Urone)

Book edition 1st Edition
Author(s) Paul Peter Urone
Pages 1272 pages
ISBN 9781938168000

# In which of the three semiconducting materials listed in Table 20.1 do impurities supply free charges? (Hint: Examine the range of resistivity for each and determine whether the pure semiconductor has the higher or lower conductivity.)

Germanium is a semiconducting material.

See the step by step solution

## Step 1: Concepts

A semiconductor material has a flow of charge because of impurities. Higher

numbers of free electrons will participate in the flow of a higher current, which

means lower resistance.

## Step 2: Explanation

After observing the range of resistivity of the three materials, it is easy to tell that

Germanium has the least resistivity (less than one). The lesser the resistivity, the

greater the conductivity of a material. Hence Germanium is more conductive (because

the impurities supply free charges).