Question

The ratio of SI units to CGS units of energy is

• A. ${10}^5$
• B. ${10}^6$
• C. ${10}^7$
• D. ${10}^{-7}$

Answer 1

The correct option is C

${10}^7$

1. The S.I unit of energy is $Joule$.
2. The CGS unit of energy is $erg$.
3. Now, we know that $1Joule={10}^{7}erg$.
4. The ratio is $\frac{1J}{1erg}=\frac{{10}^{7}erg}{1erg}={10}^7.$

Therefore, the ratio of SI units to CGS units of energy is ${\mathbf{10}}^{\mathbf{7}}$.

Thus, option (C) is the correct answer.