Four copper plates of the same dimensions are painted with red, green, white and black colours. All of them are heated upto a temperature of `300^(@)C` and then allowed to cool in the surrounding, which is at room temperature. Which plate would cool at the earliest?

A Blackbody, a Whitebody, A Bluebody and a Red coloured body are heated to same temperature and are allowed to cool in the same surroundings. Then the body that cools early is

Four identical calorimeters painted in different colors, are heated to same temperature and then allowed to cool in vacuum. Which will cool fastest?

Two copper spheres of the same external radius, one solid but the other hollow, are heated up to a certain temperature and then are allowed to cool under similar condition. Which sphere will cool faster ?

A solid sphere, a cube and a plate, all are made of same material and all have same mass. These are heated to a temperature 100^@C and then allowed to cool at the temperature of room. Which of these will cool down first –

Three objects sphere , a cube and a circular plate of equal mass are constructed from same material . All of the three objects are initially heated to a temperature of 150^@C and then left to cool at room temperature. Will they all cool down at the same ? If not, which of them will cool faster and why ?

A solid sphere and a hollow sphere of the same material and size are heated to the same temperature and allowed to cool in the same surroundings. If the temperature difference between the surroundings and each sphere is T, then :