Which of the two thermonmeter,`T_1T_2` will show a temperature of `0^@C`First?

Three liquids with masses m_1, m_2, m_3 are thoroughly mixed. If their specific heats are c_1, c_2, c_3 and their temperatures T_1, T_2, T_3 respectively, then the temperature of the mixture is

Consider two hot bodies B_(1) and B_(2) which have temperature 100^(@)"C" and 80^(@)"C" respectively at t = 0. The temperature of surroundings is 40^(@)" C" . The ratio of the respective rates of cooling R_(1) and R_(2) of these two bodies at t = 0 will be

A copper all of mass 100 g is at a temperature T. It is dropped in a copper calorimeter of mass 100 g, filled with 170 g of water at room temperature. Subsequently, the temperature of the system is found to be 75^@C . T is given by: (Given room temperature = 30^@C , specific heat of copper = 0.1 (cal)/g^@C )

The plots of intensity versus wavelength for three black bodies at temperatures T_1,T_2 and T_3 respectively are as shown. Their temperature are such that

If a piece of metal is heated to temperature and then allowed to cool in a room which is at temperature theta_0 , the graph between the temperature T of the metal and time I will be closest to :

Write the equation for thermo emf when cold junction is at 0^@C and the hot junction is at T^@C what will be the shape of graph showing variation of thermo emf with a temperature?

A paramagnetic sample shows a net magnetisation of 8 Am^-1 when placed in an external magnetic field of 0.6 T at a temperature of 4 K. When the same sample is placed in an external magneticfield of 0.2T at a temperature of 16 K,the magnetisation will be

Define the following terms. Critical Temperature (T_c)

The amount of heat energy required to raise the temperature of 1 g of Helium at NTP , from T_(1)K to T_(2)K is

The efficiency of a Carnot engine which operates between the two temperatures T_1=500K and T_2=300K is