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Water falls from a 40m high dam at the rate of per hour. Fifty percentage of gravitational potential energy can be converted into electrical energy. Using this hydro electric energy number of 100 W lamps, That can be lit, is : (Take $g = 10 m s^{- 2}$ )

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answer is B.

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Detailed Solution

$m g h = p x t$

$\begin{aligned} \frac{9 \times 10^{4} \times g \times 40}{3600} \times 0.5 = n \times 100 \times 1 \\ \frac{10^{4} \times 0.5}{100} = n \\ 100 \times 0.5 = n \\ n = 50 \end{aligned}$

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