Question

Energy equivalent to one erg, one joule and one calorie are in order:

• A. 1 erg > 1 J > 1 cal
• B. 1 erg > 1 cal > 1 J
• C. 1 cal > 1 J > 1 erg
• D. 1 J > 1 cal > 1 erg

Answer 1

The correct option is C 1 cal > 1 J > 1 erg

$1cal=4.185J=4.18\times {10}^{7}erg=4.18/1.602\times {10}^{19}eV$
the correct order is 1 cal > 1 J > 1 erg