A block of metal is heated to a temperature much higher than the room temperature and allowed to cool in a room free from air currents. Which of the following curves correctly represents the rate of cooling

A block of metal is heated to a temperature of 200^(@)C which is much higher than the room temperature. It is allowed to cool up to room temperature, in a room which is free from air currents. Its cooling curve (graph of temperature against time) is based on

A block of copper is heated in a furnance and kleft in a room to cool.Which of the following curves represents the correct behaviour?

A metallic solid sphere and a hollow sphere of same material and external radius are heated to the same temperature and allowed to cool in the same environment .Which of the two has aa greater cooling rate?

If a piece of metal is heated to temperature theta and the allowed to cool in a room which is at temperature theta_0 , the graph between the temperature T of the metal and time t will be closet to