Thermal Propert...

Assertion: The equivalent thermal conductivity of two plates of same thickness in contact (series) is less than the smaller value of thermal conductivity
Reason: For two plates of equal thickness in contact (series) the equivalent thermal conductivity is given by

Assertion: A hollow metallic closed container maintained at a uniform temperature can act as a source of black body radiation
Reason: All metals act as a black body.

Assertion: If the temperature of a star is doubled then the rate of loss of heat from it becomes 16 times
Reason: Specific heat varies with temperature.

Assertion: The radiation from the sun's surface varies as the fourth power it's absolute temperature.
Reason: The sun is not a black body.

Assertion: The radiation from the sun\'s surface varies as the fourth power of its absolute temperature.
Reason: The sun is not a black body

Assertion: Blue star is at high temperature than red star
Reason: Wien\'s displacement law states that T ∝ (1/λ_m)

Assertion: While measuring the thermal conductivity of liquid experimentally, the upper layer is kept hot and the lower layer is kept cold.
Reason: This avoids heating of liquid by convection.

Assertion: A brass tumbler feels much colder than a wooden tray on a chilly day.
Reason: The thermal conductivity of brass is less than that of wood.

Assertion: Like light radiations, thermal radiations are also electromagnetic radiation.
Reason: The thermal radiations require no medium for propagation.

Assertion: Snow is better insulator than ice
Reason: Snow contains air packet and air is good insulator of heat.