The rate of cooling of a body is .

Newton’s law of cooling says that the rate of cooling of a body is proportional to the temperature difference between the body and its surrounding when the difference in temperature is small. (a) Will it be reasonable to assume that the rate of heating of a body is proportional to temperature difference between the surrounding and the body (for small difference in temperature) when the body is placed in a surrounding having higher temperature than the body? (b) Assuming that our assumption made in (a) is correct estimate the time required for a cup of cold coffee to gain temperature from 10^(@)C to 15^(@)C when it is kept in a room having temperature 25^(@)C . It was observed that the temperature of the cup increases from 5^(@)C to 10^(@)C in 4 min

The rate of cooling of a body by radiation depends on :

The rates of cooling of a body at temperatures 100^(@)C and 80^(@) are x_(1) and x_(2) respectively, when placed in a room of temperature 40^(@)C then (x_(1))/(x_(2)) is

According to Neton's law of cooling, the rate of colling of a body is proportional to (Deltatheta)^n , where Deltatheta is difference of temprature of the body and the surroundings, and n is equal to

The rate of cooling of a body depends on –

The rate of cooling of a body depends upon

Statement-1: Two metallic spheres of same size, one of copper and the other of aluminium, heated to the same temperature, will cool at the same rate when they are suspended in the same enclosure. Statement-2: The rate of cooling of a body depends on the excees of temperature of the body over the surroundings.

Rate of cooling of a body is 0.2^@C/min , when excess temperature is 20^@C . The proportionality constant is

Rate of cooling of a body is 0 .2° C/min, when excess temperature is 20° C. The proportionality constant is