Water falling from a `50m` high fall is to be used for generating electric power. If `1.8xx10^(5)kg` of water falls per hour and half the gravitational potential energy can be converted inito electric energy, how many 100 watt lamps can be lit ?

Options

A. 75
B. 100
C. 125
D. 150

Answer

C

Explanation

Loss in P.E. `=1.8xx10^5xx10xx50`
energy used to generate power `=(900xx10^5)/(2xx3600)=12500`
Number of bulbs`=(12500)/(100)=125`