Question

Which of the following options of statements related to linear expansion are true?
(a) Increase in length of a wire or a rod due to increase in temperature,
(b) 12 = 4(1+2 AT)
(c) Lambda is called the coefficient of linear expansion of the solid substance.
(d) Lambda is the constant of proportionality.
(1) a, b & c
(2) a, c&d
(3) b, c&d
(4) a, b, c&d​

Answer 1

To find:

True statements in the given options.

Solution:

• Increase in length of a wire or a rod occurs due to increase in temperature:- yes, this statement is true.

• The new length due to ∆T change in temperature will be given as :

$\boxed{L = L_{0}(1 + \alpha \Delta T)}$

So, 2nd statement is true.

• $\lambda$ is coefficient of linear expansion of the solid; it is a materialistic property and has a constant value for a particular solid substance. So, 3rd statement is also true.

• Initially, the change in length was calculated as follows:

$\boxed{\Delta L \propto \: L_{0}(\Delta T)}$

From here, a constant $\alpha$ was introduced, hence 4th statement is also correct.

Hope It Helps.

Answer 2

Answer

i don't no in this question answer