List of top Physics Questions on Thermal Physics asked in MET

At which temperature, magnitude of \( ^\circ C \) and \( ^\circ F \) are equal?

A thin copper wire of length L increases in length by 1%, when heated from \(T_1\) to \(T_2\). What is the percentage change in area when a thin copper plate having dimensions \((10L \times 2L)\) is heated from \(T_1\) to \(T_2\)?

A body cools in 7 min from $60^{\circ}C$ to $40^{\circ}C$. What times (in min) does it take to cool from $40^{\circ}C$ to $28^{\circ}C$, if surrounding temperature is $10^{\circ}C$? (Assume Newton's law of cooling)}

A 2 kg copper block is heated to 500\(^\circ\)C and is then placed on a large block of ice at 0\(^\circ\)C. If the specific heat capacity of copper is 400 J kg\(^{-1}\) \(^\circ\)C\(^{-1}\) and latent heat of fusion of water is \(3.5 \times 10^5\) J kg\(^{-1}\), the amount of ice that can melt is

The temperatures of two bodies \(A\) and \(B\) are respectively 727\(^\circ\)C and 327\(^\circ\)C. The ratio \(H_A : H_B\) of the rates of heat radiated by them is

The surface area of a black body is \(5 \times 10^{-4}\) m\(^2\) and its temperature is 727\(^\circ\)C. The energy radiated by it per minute is (\(\sigma = 5.67 \times 10^{-8}\) J/m\(^2\)-s-K\(^4\))

If the energy of a hydrogen atom in \(n^{\text{th}}\) orbit is \(E_n\) then energy in the \(n^{\text{th}}\) orbit of a singly ionized helium atom will be

The molar heat capacity of rock salt at low temperature varies with temperature according to Debye's \( T^3 \) law. Thus \( C = k \frac{T^3}{\theta^3} \) where \( k = 1940 \, \text{Jmol}^{-1} \text{K}^{-1} \) and \( \theta = 281 \, \text{K} \). Calculate how much heat is required to raise the temperature of 2 moles of rock salt from 10 K to 50 K:

An organic compound on heating with CuO produces \( CO_{2} \) but no water. The organic compound may be

Two stars emit maximum radiation at wavelength 3600 and 4800 respectively. The ratio of their temperatures is: