Gujarat BoardEnglish MediumSTD 9ScienceWork, Power And Energy1 Mark
Question
One joule = _______ erg.
✓
Answer
One joule $=10^7$ erg.
Explanation:Unit of energy is joule $= kgm ^2 / s ^2$ Joule is a $MKS$ unit and erg is a $CGS$ unit $MKS$ $=$ $CGS$ $1\ m=$
$100\ cm\ 1\ s=1\ s\ 1\ kg=1000\ gm$ From above:
$1$ joule $=1 kgm ^2 / s ^2=1000 \times 10000 / 1 cmm ^2 / s ^2=10^7 gm ^* cm^2 / s ^2=10^7 erg$ So, $1$ joule $=10^7 erg$
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