Question

Energy equals of a mass of one microgram in kilo joules is

• A. $9\times {10}^{7}kJ$
• B. $10\times {10}^{3}kJ$
• C. $8\times {10}^{2}kJ$
• D. $7\times {10}^{4}kJ$

Answer 1

Answer: (A)

Given

Energy of 1 microgram=?

Solution

We will use Energy mass equivalence

$E=m{c}^2$

$E={10}^{-6}kg\times (3\times {10}^8{)}^{2}m/s^2$

$E=9\times {10}^{10}J$

Option $A$ is correct.