Thermal Expan...

Thermal Expansion

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Q. Rivet is heated before fixing in the hole to join two metal plates. Why ?

The length of a ceramic block is being measured by a metallic ruler, which gives readings $L_{1}$ at temperature $T_{1}$ , and $L_{2}$ at a temperature $T_{2}$ . It is known that the ruler gives a correct reading at temperature $T$ , and that the ceramic block does not significantly expand for the temperature differences in question. What is the coefficient of linear expansion of the ruler?

$(\frac{L_{2} - L_{1}}{T (L_{2} - L_{1}) + L_{1} T_{1} - L_{2} T_{2}})$
$(\frac{L_{1} - L_{2}}{T (L_{1} - L_{2}) + L_{1} T_{1} - L_{2} T_{2}})$
$(\frac{L_{1} - L_{2}}{T (L_{1} - L_{2}) + \frac{T_{1} T_{2}}{T} L_{1}})$
$(\frac{L_{2} - L_{1}}{T (L_{2} - L_{1}) + L_{2} T_{2}})$

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Q. Rivet is heated before fixing in the hole to join two metal plates. Why ?

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All solids expand by the same amount when heated to the same rise in temperature.

True
False

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Q. As temperature decreases, the kinetic energy of molecules ___.

decreases
remains same
increases
becomes double the initial value

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Q. Kinetic energy of the molecules of a substance increases with increase in__________.

mass
temperature
area
volume

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