Question

if the volume of block of metal changes by 0.12% when it is heated through 20 degree celsius , what is the coefficient of volume expansion of metal ?

Answer 1

∆V = Vα∆T --------> ∆V/V = α∆T

Change in volume = ∆V/V = 0.12%

∆V/V = α∆T

0.12% = α×20

$\frac{0.12}{100} = \alpha \times 20 \\ \\ \frac{12}{1000} = 20 \alpha \\ \\ \alpha = \frac{12}{1000} \times \frac{1}{20} = \frac{6}{10000} = 6 \times {10}^{ - 4} \\ \\ \alpha = 6 \times {10}^{ - 4}$

Hope this is helpful to you

Pls mark as brainliest

Follow me and I'll follow you back