Tag: physics

The reason for providing copper bottoms in steel pans is :

Four rods of same material but with different radii and lengths are used to connect two reservoirs of heat with the same temperature difference. Which one will conduct more heat

Which of the following arrangements is correct on the basis of conductivity of materials?

What will be the conductivity of pure silicon crystal at 300 K temperature if  electron cottoer pair at this temperature is $ 1.072 \times 10^{10} /cm^3 $ and $ \mu _n = 1350 cn^2 /V-s and \mu _p = 480 cm^2/ V-s $ ?

 Inorder to have a difference of $25 \,cm$ in their length at all temperatures, the lengths of iron and copper rods at $0^o C$ are $(\alpha _{iron} = 12 \times 10^{-6} {^oC}^{-1}, \alpha _{copper} = 17 \times 10^{-6} {^oC}^{-r})$

The heat capacity of a body depends on 

In a steady state of thermal conduction, temperature of the ends $A$ and $B$ of a $20cm$ long rod are $100^oC$ and $0^oC$, respectively. What will be the temperature of the rod at a distance of $6cm$ from the end $A$ of the rod?

Which of the following is a bad conductor of heat?

The waves produced by the horn of a car consists of

While travelling by train, when the train passes through the tunnel, why does our ear aches ?