Express (a) the energy required to break one bond in DNA `(10^(-10)J)` in eV.
(b) the kinetic energy of an air molecule `(10^(-21)J)` in eV.
(c) the daily intake of a human adult `(10^(7)J)` in kilocalories.

Explanation

(a) Energy required to break one bond of DNA
`=(10^(-20))/(1.6xx10^(-19)J//eV)=0.06eV`
(b) Typical energy of a proton in a nucleus
`=(10^(-13))/(1.6xx10^(-19)J//eV)=625000eV`
(c ) Energy released in burning 1000 kg of coal
`=(3xx10^(-10))/(4.2xx10^(3)J//Kcal)=7142857. 14 kcal`