Question

3 MARK QUESTIONS
20. State the factors on which the conduction of heat through a substance depends. Obtain an
expression for the heat conducted and hence define coefficient of thermal conductivity and
gives its units and dimensions.​

Answer 1

Factors on which the

conduction or thermalconductivity depends are

1.Area of cross section, directly proportional .

2.It is directly proportional to temperature difference( ΔT)

3.Inversely proportional to length of the substance.

EXPRESSION

see the attachment.

Dimension

[M1L1T−3Θ−1],

where mass (M), length (L), time (T), and temperature (Θ).

Unit =

(W/(m⋅K))

Answer 2

Explanation:

इट इज इक्वल टू माइनस के एडीटीओ पंडी एक्स