Multiple choice general knowledge science & technology

How many Ergs are these in 1 Joule?

  1. 102

  2. 104

  3. 106

  4. 107
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

1 Joule equals 10^7 ergs because the erg is the CGS (centimeter-gram-second) unit of energy, while the Joule is the SI (meter-kilogram-second) unit. The conversion follows from 1 Joule = 1 Newton-meter = 1 kg·m²/s², and 1 erg = 1 dyne-centimeter = 1 g·cm²/s². Since 1 kg = 1000 g and 1 m = 100 cm, the conversion factor is 10^7.

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