1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
dimaraw [331]
3 years ago
8

Which is true about the resistivities of a metal and a semiconductor as the temperature is increased?

Physics
2 answers:
allochka39001 [22]3 years ago
7 0

Answer:

The resistivity of metals decreases on increase in temperature whereas the resistivity of semiconductors increases with increase in temperature.

Explanation:

The majority charge carriers in metals are electrons which are explained by the electron-sea model. The electron sea model considers metal to have a sea of conducting electrons in between the nucleus arrangement.

The nucleus is bind firmly within the lattice structure and when the temperature has increased this accounts for the lattice vibrations as a result offering obstructions to the valence electrons which increases its bulk resistivity.

The variation in the resistivity of metal is given by:

\rho=\rho_0[1+\alpha_t(T-T_0)]

where:

\alpha_t=temperature coefficient of resistivity which is defined as the fractional change in resistivity per unit change in temperature.

\rm \rho\ and\ \rho_0\ are\ the\ resistivity\ at\ temperature\ T\ and\ T_0\ respectively

At temperatures 500 K above the room temperature we have the variation of resistivity of the metal in a linear manner.

  • For semiconductors, the value of coefficient of resistivity is negative which implies that the resistivity of semiconductors decreases as temperature increases.
MAVERICK [17]3 years ago
4 0

Answer:

Explanation:

According to the electrical conductivity, there are three types of materials:

Metals are the conductors which allows the electric current to flow through them. For example, iron , copper, silver, etc.

As the temperature of a metal increases the resistivity also increases.

Semiconductors are the material which are insulators at room temperature but they behaves like a conductor as the temperature increases.

The resistivity of a semiconductor decreases as the temperature increases.

You might be interested in
A car goes North a distance of 120 kilometers during a time period of 3.0 hours. What is the average
DIA [1.3K]

Answer:

the average speed of the car during this time interval is 40 m/s i thinkk..

8 0
3 years ago
A ship's wheel has a moment of inertia of 0.930 kilogram·meters squared. The inner radius of the ring is 26 centimeters, and the
Vikki [24]

We can use the formula of the moment of inertia given by:

r\cdot F=I\alpha

Where:

r = Distance from the point about which the torque is being measured to the point where the force is applied

F = Force

I = Moment of inertia

α = Angular acceleration

So:

\begin{gathered} r\cdot F=(-0.26\times314+290\times0.32)=92.8-81.64=11.16 \\ I=0.930 \\ so,_{\text{ }}solve_{\text{ }}for_{\text{ }}\alpha: \\ \alpha=\frac{r\cdot F}{I} \\ \alpha=\frac{11.16}{0.930} \\ \alpha=\frac{12rad}{s^2} \end{gathered}

Answer:

12 rad/s²

8 0
1 year ago
In the picture below, the candle is heating the water in the tank. Which picture shows how the water will move as it gets hot?
Masteriza [31]

The first picture, at the top, does.

5 0
3 years ago
Read 2 more answers
What are loops of gas on sun that link different parts of sunspot regions together?
love history [14]
So we want to know what are loops of gas on the Sun that link different parts of sunspot regions together. A large and bright gaseous feature that extends from the surface of the Sun that links different parts of sunspot regions together is called Prominence. They are on the Suns surface in the photosphere and they extend outwards into the Corona. 
7 0
3 years ago
If Earth were twice as far from the sun, the force of gravity attracting the Earth to the Sun would be
zalisa [80]
If Earth was twice as far from the sun, the force of gravity attracting the Earth to the sun would be only one-quarter as strong. The correct answer will be C. 
6 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following terms relate to the meaning of "physical"?
    11·2 answers
  • Are waves matter or not?
    8·1 answer
  • Which is described as the flow of charge particles?
    14·1 answer
  • If A bar + B bar = C bar and magnitude of A bar + magnitude of B bar = magnitude of C bar. Then the angle between A bar and B ba
    6·1 answer
  • A backpack has a mass of 8 kg. It is lifted and given 54.9 J of gravitational potential energy. How high is it lifted? Accelerat
    14·2 answers
  • How is momentum conserved is a Newton's cradle when one steel ball hits the other
    7·1 answer
  • You check the weather and find that the winds are coming are coming from the west at 15 miles per hour. This information describ
    11·2 answers
  • In the water cycle ,matter moves towards of gravity during
    11·1 answer
  • List one example of contact and non contact force
    15·1 answer
  • How are the resources of europe both an advantige and disadvantage to the life Europe
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!