Question

The sun radiates energy in all directions. The average radiations received on the earth surface from the sun is 1.4 kilowatt/m². The average earth-sun distance is 1.5 × 10¹¹metres. The mass lost by the sun per day is (1 day = 86400 seconds)

• A. 4.4 × 10⁹ kg
• B. 7.6 × 10¹⁴ kg
• C. 3.8 × 10¹² kg
• D. 3.8 × 10¹⁴ kg

Answer 1

Answer: (D)

3.8 × 10¹⁴ kg

Answer 2

E = IAt

E = I(4pd²)t

E = mc² m = $\frac{I(4\pi d^{2})t}{c^{2}}$