A solar water heater cannot be used to get hot water on
(a) a sunny day. (b) a cloudy day.
(c) a hot day. (d) a windy day
(b) a cloudy day.
A solar water heater can only work when it is provided some solar energy.
Solar energy is provided by the sun.
On a cloudy day, the sun’s heat are blocked by the clouds and it can not reach the earth.
Hence, in the absence of the sun’s heat, a solar water heater can not work.