Is e=mc2 true plz tell me is it true?
E = m c^2 is a true representation of the amount of energy that goes into making a quantity of mass (and vice versa). For example, the Sun loses roughly 4 million tonnes per second because of the fusion reaction where 4 hydrogen atoms are changed into one helium atom (one helium atom weighs a tiny bit less than 4 hydrogen atom — some mass is lost). 4,000,000 tonnes = 4,000,000,000 kg = 4×10^9 kg c = 300,000,000 m/s = 3×10^8 m/s c^2 = 9×10^16 (m/s)^2 = 9×10^16 mm/ss m c^2 = 4×10^9 kg * 9×10^16 mm/ss m c^2 = 36×10^25 watts = 3.6×10^26 W [the observed output is 3.85×10^26 watts, but I used a round figure of 4 million tonnes when it is really a bit more] So, looks like it is true.
