Question

The temperature of a body changes from ${15}^{\circ }C$ to ${75}^{\circ }C$. What is the corresponding change in (a) Fahrenheit scale (b) Kelvin scale?

Answer 1

We know $9C=5(F-32)$

When $C={15}^0$

$9\times 15=5(F-32)$

$F={59}^0$

When $C={75}^0$

$9\times 75=5(F-32)$

$F={167}^0$

Change in Fahrenheit scale $=167-59={108}^{o}F$

For Kelvin scale:

$K=273+C$

When C is ${15}^o$

$K=273+15=288$

When C is ${75}^o$

$K=273+75=348$

So change in kelvin scale is $348-288=60K$