Q 7 8 and 9
Q7. What happen to the electrical conductivity when a metal is heated?
Q8. Which colour appears on the surface of aluminium when it is kept in air for sometimes?
Q9. Which property of copper and aluminium makes then suitable for making boilers and cooking.
Dear Student,
7. On heating, the electrical conductivity of metals decreases since electrons move faster due to absorption of heat energy, resulting in more collision, thereby increasing resistance.
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7. On heating, the electrical conductivity of metals decreases since electrons move faster due to absorption of heat energy, resulting in more collision, thereby increasing resistance.
Please ask the other questions in a separate thread.
Hope this information will clear your doubts about topic.
If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.
Regards