Question 28 of 28advanced🔧 ApplyNumerical4 marks

Calculate and write the answer using scientific notation: (i) If one star is counted every second, how long would it take to count all the stars in the universe? Answer in terms of the number of seconds using scientific notation. (ii) If one could drink a glass of water (200 ml) every 10 seconds, how long would it take to finish the entire volume of water on Earth?

(i)
Answer

2×10232 \times 10^{23} seconds

(ii)
Answer

Approximately 6×10226 \times 10^{22} seconds

Explanation

(i) The chapter states there are 2×10232 \times 10^{23} stars. At 1 star per second, time = 2×10232 \times 10^{23} seconds. (ii) Water on Earth ≈\approx 2×10252 \times 10^{25} drops. At 16 drops/ml, volume ≈\approx 1.25×10241.25 \times 10^{24} ml. At 200 ml per 10 seconds, time ≈\approx 6×10226 \times 10^{22} seconds.

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