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

The average human consumption in a day is
`(10^(7)J)/(4.2xx10^(3)J"/"kcal) cong 2400kcal`
We point out a common misconception created by newspapers and magzines. They mention food values in calories and urge us to restrict diet intake to below 2400 calories. What they should be saying is kilocalories (kcal) and not calories. A person consuming 2400 calories a day will soon strave to death! 1 food calorie is 1 kcal.