Question

Daily food intake of a human adult is equivalent ${10}^7\text{J}$. Its value in electron volt is

• A. $1.6\times {10}^{-25}\text{eV}$
• B. $6.25\times {10}^{+25}\text{eV}$
  
• C. $3.25\times {10}^{-20}\text{eV}$
• D. $6\times {10}^{+20}\text{eV}$

Answer 1

The correct option is B $6.25\times {10}^{+25}\text{eV}$


Relation between joule and electron volt (eV) is given by
$1\text{J}=1.6\times {10}^{–19}\text{eV}$
So, energy in electron volt
$=\frac{{10}^7}{1.6\times {10}^{-19}}=6.25\times {10}^{25}\text{eV}$