Convection and Rate of cooling

A spherical black body of radius n radiates power p and its rate of cooling is R. then.

Convection can occur only in fluids.

Land and sea breezes are convection currents of cold and warm air.

A spherical solid blakc body of radius 'r' radiates power 'H' and its rate of cooling is 'C'. If density is constant then which of the following is/are true.

According to Newton's law, rate of cooling is proportional to the difference between the temperature of the body and the temperature of the air. If the temperature of the air is 20^(@)C and body cools for 20 min from 100^(@)C to 60^(@)C then the time it will take for it temperature to drop to 30^(@) is

According to ‘Newton’s Law of cooling’, the rate of cooling of a body is proportional to the

A very thin metallic shell of radius r is heated to temperature T and then allowed to cool. The rate of cooling of shell is proportional to

Liquids and gases get heated by convection. Explain the convection on the basis of kinetic model.

Equal masses of two liquids are filled in two similar calorimeters. The rate of cooling will

A hot liquid is kept in a big room. According to Newton's law of cooling rate of cooling liquid (represented as y) is plotted against its temperature T . Which of the following curves may represent the plot?