Question

In a nuclear reaction, the energy released is equal to 5.4 x 1015 joules. Calculate the mass lost in this reaction. (1 J = 1 kg m2/s2)
6.0 x 10-2 kg
4.86 x 10-1 kg
1.8 x 10-1 kg
1.62 x 102 kg

Answer 1

I think the answer is A.

Answer 2

Answer:

A) 6 *10^-2 kg

Explanation:

From Einstein equation of mass and energy inter conversion,

E = MC²

E = Energy released = 5.4 * 10¹⁵ J

M = mass = ?

C = spend of light = 3.0*10⁸m / s

E = mc²

M = E / c²

M = 5.4 * 10¹⁵ / (3.0 * 10⁸)²

M = 0.06kg = 6 * 10^-2 kg