Question

V. ANSWER THE FOLLOWING IN DETAIL.
1)Explain how the conduction of heat occurs in the metal rod?
2) In a thermos flask how heat loss by all three modes of heat
transfer is minimized. Explain.

Answer 1

Explanation:

When the rod is heated the temperature of the rod near the heated end increases and the molecules at that end vibrating faster. These vibrations are passed along rod and thus heat is transferred along the length of the rod. The conduction of heat is more effective when the molecules are packed close together

Answer 2

Answer:

(2) The outer surface of its inner wall and the inner surface of its outer wall are silvered. This prevents heat transfer due to radiation. ... The double-walled glass vessel and vacuum prevents heat loss by conduction. The insulating stopper or cork at the top minimizes heat loss by convection.

(1)..... When the rod is heated the temperature of the rod near the heated end increases and the molecules at that end vibrating faster. These vibrations are passed along rod and thus heat is transferred along the length of the rod. The conduction of heat is more effective when the molecules are packed close together.

Explanation:

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