In 1 Joule, how many Ergs are there?

In the centimeter-gram-second (CGS) system, the unit of energy is the erg, while in the International System of Units (SI), it's the joule.

The relationship between these units is:

1 joule = 10,000,000 ergs

This is because:

1 joule is defined as 1 newton-meter.

In CGS units:

1 newton = 10⁵ dynes

1 meter = 100 centimeters

Therefore:

1 joule = 1 newton-meter

= (10⁵ dynes) × (100 centimeters)

= 10⁷ dyne-centimeters

Since 1 erg is defined as 1 dyne-centimeter, it follows that 1 joule = 10⁷ ergs.

Thus, the correct option is 10⁷.