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प्रश्न
Give reasons for the following:
Telephone wires sag in summer.
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उत्तर
Telephone wires sag in summer because due to heat of the sun, the wire expands and increases in length, thus they sag in summer.
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संबंधित प्रश्न
Equal volumes of different liquids expand by a different amount when they are heated to the same rise in temperature.
A longer rod expands ........... than a shorter rod on being heated to the same temperature.
A metal plate is heated. State three factors on which the increase in its area will depend.
Describe an experiment to showthat air expands on heating.
Define the following term:
Coefficient of superficial expansion
Define the following term:
Coefficient of cubical expansion
A bimetal strip is shown in the below diagram before heating. Draw a diagram to show how it bends on heating and on cooling.
What difference do you think heating the solid will make in their molecules?
