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Aman keeps a plastic bottle, a wooden spoon and a metallic spoon in a closed room overnight. The room temperature is 30 °C. In the morning he records the temperatures of the three objects as T1, T2 and T3. Which of the following most likely represents the relation between them?

Aman keeps a plastic bottle, a wooden spoon and a metallic spoon in a closed room overnight. The room temperature is 30 °C. In the morning he records the temperatures of the three objects as T1, T2 and T3. Which of the following most likely represents the relation between them? Correct Answer T<sub>1</sub> = T<sub>2</sub> = T<sub>3</sub>

Concept:

Heat is transferred by three modes:

  • Conduction: The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction. 
    • Conductors: The materials which allow heat to pass through them easily are conductors of heat. For examples, aluminium, iron and copper.
    • Insulators: The materials which do not allow heat to pass through them easily are poor conductors of heat such as plastic and wood. Poor conductors are known as insulators. The water and air are poor conductors.
  • Convection: When water is heated, the water near the flame gets hot. Hot water rises up. The cold water from the sides moves down towards the source of heat. This water also gets hot and rises and water from the sides moves down. This process continues till the whole water gets heated. This mode of heat transfer is known as convection.
  • Radiation: From the sun the heat comes to us by another process known as radiation. The transfer of heat by radiation does not require any medium. It can take place whether a medium is present or not. 

Explanation:

When all the materials are kept at 30° C, then all the materials will be at equilibrium temperature after some as this is closed room.

The Metallic Spoon get heated to 30° C (Say T3)

The plastic bottle and wooden spoon are kept (T1 = T2).

⇒  T1 = T2 = T3 = T Room Temp.

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