Question

calculate the total amount of energy released if 20 g of given mass is completely convert into energy​

Answer 1

Given :

Mass of substance = 20g

To Find :

Amount of energy associated with the substance.

Solution :

★ According to Albert Einstein, mass and energy are inter-convertible.

In 1905, be established the mass energy equivalence.

The energy associated with mass m is given by E = mc²

Where c is the speed of light in vacuum

As mass can be converted into energy, so in law of conservation of energy, we include mass also$.$

➠ E = mc²

➠ E = 20 × (3 × 10⁸)²

➠ E = 20 × 9 × 10¹⁶

➠ E = 180 × 10¹⁶

➠ E = 1.8 = 10¹⁸ J