Question

If the rate of emission of energy from a star is 2.7 × 10³⁶ J/sec, the rate of loss of mass in the star will be -

• A. 3 × 10¹⁸ kg/sec
• B. 3 × 10¹⁹ kg/sec
• C. 3 × 10²⁰ kg/sec
• D. 3 × 10²¹ kg/sec

Answer 1

Answer: (B)

3 × 10¹⁹ kg/sec

Answer 2

E = mc²

\ m = = $\frac { 2.7 \times 10 ^ { 36 } } { 9 \times 10 ^ { 16 } }$

= $\frac { 27 \times 10 ^ { 35 } } { 9 \times 10 ^ { 16 } }$= 3 × 10¹⁹ kg/sec