Question

The temperature of liquid hydrogen is $20K$.What is this temperature on the Fahrenheit scale?

• A. ${495.4}^{\circ }F$
• B. $-{423.4}^{\circ }F$
• C. $-{108.56}^{\circ }F$
• D. $-{487.4}^{\circ }F$

Answer 1

The correct option is B $-{423.4}^{\circ }F$

The conversion between different scales of temperature is given by

$T_{{(}^{o}F)}=T_{{(}^{o}C)}\times \frac{9}{5}+32$ and $T_{{(}^{o}C)}=T_{\left(K\right)}-273$

In Kelvin scale, we have $C=20-273=-{253}^{o}C$

Thus, $-{253}^{o}C$ in Fahrenheit scale is given by $F=(-253)\times \frac{9}{5}+32=-455.4+32=-{423.8}^{o}F$