Question

1. Look at the following pictures and write the primary mode of transfer of heat in each case:-
(a) From the sun to earth _________________________
(b) From the flame to the vessel ____________________
(c) Movement of air - _________________
(d) From the flame to the metal rod _______________
(e) From the flame to vessel - ___________________
From the vessel to water - ___________________
From the vessel to its handle - _______________
From the fire to the sides - __________________

Answer 1

$\huge {\mathcal{\purple{A}\green{N}\pink{S}\blue{W}\purple{E}\green{R}\pink{!}}}$

1)-Radiation

2)-Conduction

3)-Convection

4)-Conduction

5)-Convection

6)-Conduction

7)-Radiation

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Answer 2

Answer:

(a) From the sun to earth: - Radiation

Explanation: - No medium exists between Sun and Earth, and Radiation doesn't require a medium to transfer the heat.

(b) From the flame to the vessel: - Conduction

Explanation: - Here, the vessel is made up of solid material, and for heat transfer in the mode of conduction, some solid material is required to transfer heat, so here vessel act as heat conduction material.

(c) Movement of air - Radiation

Explanation: - Now here, air doesn't require to transfer the heat, therefore for movement of air Radiation is correct

(d) From the flame to the metal rod: - Conduction

Explanation: - Here, the metal rod is made up of solid material, and for heat transfer in the mode of conduction, some solid material is required to transfer heat, so here metal rod act as heat conduction material.

(e) From the flame to vessel: - Conduction

Explanation: - Here, the vessel is made up of solid material, and for heat transfer in the mode of conduction, some solid material is required to transfer heat, so here vessel act as heat conduction material.

(f) From the vessel to water - Convection

Explanation: - Now here, convection is the transfer of heat only from solid material to fluid material like liquid and gas. So here the vessel is solid material and water is fluid material which has a medium to transfer the heat

(g) From the vessel to its handle - Conduction

Explanation: - Here, the vessel and its handle are made up of solid material, which set the medium to transfer the heat, and for heat transfer in the mode of conduction, some solid material is required to transfer heat, so here vessel act as heat conduction material.

(h) From the fire to the sides - Radiation

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