Question

The energy supplied by a power plant is $40$ million kilowatt hour. It is supplied by annihilation of matter, the mass that is annihilated is

• A. $1.6gm$
• B. $1.6kg$
• C. $1.6mg$
• D. $1.6amu.$

Answer 1

Answer: (A)

$1.6gm$

Let $m$ be the annihilated mass.

Energy supplied by the power plant=$m{c}^2=40000000\times {10}^3\times 3600J$

where $c$ is the speed of light=$3\times {10}^{8}m/s$

Hence $m=1.6gm$