Multiple choice general knowledge science & technology How many Ergs are these in 1 Joule? 102 104 106 107 Reveal answer Fill a bubble to check yourself D Correct answer Explanation One joule equals 10^7 ergs because 1 J = 1 kg·m^2/s^2 and 1 erg = 1 g·cm^2/s^2, so 1 J = (1000 g) × (100 cm)^2/s^2 = 10^7 erg.