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Which of the following statements is wrong?
- a)Resistance of a semiconductor decreases on increasing the temperature
- b)Displacement of holes is opposite to the displacement of electrons in an electric field
- c)Resistance of a good conductor decreases on increasing the temperature
- d)n-type of semiconductor are neutral
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Which of the following statements is wrong?a)Resistance of a semicondu...
Explanation:
The statement that is wrong is option 'C': Resistance of a good conductor decreases on increasing the temperature.
Why is this statement wrong?
The resistance of a conductor is dependent on its temperature. However, the relationship between resistance and temperature is different for different types of conductors.
For a good conductor, such as copper or aluminum, the resistance increases with an increase in temperature. This is because when the temperature of a conductor is increased, the atoms in the conductor vibrate more vigorously, which increases the frequency of collisions between the electrons and the atoms. This increased frequency of collisions leads to an increase in resistance.
On the other hand, for a semiconductor, the resistance decreases with an increase in temperature. This is because an increase in temperature increases the number of free electrons and holes in the semiconductor, which results in an increase in conductivity and a decrease in resistance.
Therefore, option 'C' is the wrong statement.
Other options explained:
a) Resistance of a semiconductor decreases on increasing the temperature: This statement is true for a semiconductor as explained above.
b) Displacement of holes is opposite to the displacement of electrons in an electric field: This is also a true statement. In a semiconductor, when an electric field is applied, the movement of electrons is in the direction of the field, while the movement of holes is in the opposite direction.
d) n-type of semiconductor are neutral: This statement is partially true. An n-type semiconductor has excess electrons, making it negatively charged overall. However, the charge of individual atoms in the semiconductor is still neutral.
The statement that is wrong is option 'C': Resistance of a good conductor decreases on increasing the temperature.
Why is this statement wrong?
The resistance of a conductor is dependent on its temperature. However, the relationship between resistance and temperature is different for different types of conductors.
For a good conductor, such as copper or aluminum, the resistance increases with an increase in temperature. This is because when the temperature of a conductor is increased, the atoms in the conductor vibrate more vigorously, which increases the frequency of collisions between the electrons and the atoms. This increased frequency of collisions leads to an increase in resistance.
On the other hand, for a semiconductor, the resistance decreases with an increase in temperature. This is because an increase in temperature increases the number of free electrons and holes in the semiconductor, which results in an increase in conductivity and a decrease in resistance.
Therefore, option 'C' is the wrong statement.
Other options explained:
a) Resistance of a semiconductor decreases on increasing the temperature: This statement is true for a semiconductor as explained above.
b) Displacement of holes is opposite to the displacement of electrons in an electric field: This is also a true statement. In a semiconductor, when an electric field is applied, the movement of electrons is in the direction of the field, while the movement of holes is in the opposite direction.
d) n-type of semiconductor are neutral: This statement is partially true. An n-type semiconductor has excess electrons, making it negatively charged overall. However, the charge of individual atoms in the semiconductor is still neutral.
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Which of the following statements is wrong?a)Resistance of a semiconductor decreases on increasing the temperatureb)Displacement of holes is opposite to the displacement of electrons in an electric fieldc)Resistance of a good conductor decreases on increasing the temperatured)n-type of semiconductor are neutralCorrect answer is option 'C'. Can you explain this answer?
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