Answer:
2×10⁷ bulbs.
Explanation:
From the question,
The the power generated by the water flows over a Niagara section is given as,
P = M'gh......................... Equation 1
Where M' = Fall rate, g = acceleration due to gravity, h = height of fall.
Given: M' = 1.31×10⁶ kg/s, g = 9.8 m/s², h = 71 m
Substitute into equation 1
P = 1.31×10⁶×9.8×71
P = 9.115×10⁸ W.
Number of 40 W bulb it can lit = P/40
= 9.115×10⁸/40 = 2.27×10⁷ ≈ 2×10⁷ bulbs.
