Question

Why does sand heat up faster than water and air?
Answer on the basis of the above activity

Answer 1

See, when you keep them in sunlight you are supplying equal heat to each for equal time..
Now, if sand requires x joules of heat to rise it's temperature through 1℃
Water will require 4x joules for rise of 1℃..
So same time , same heat but different rise in temperature just because of *specific heat capacity of water is far greater than sand..

Specific heat capacity = Heat required by unit mass of a body to rise it's temperature through 1℃...

Don't misunderstand me, but these questions are too easy and you can answer yourself.
Just think a Little Bit for the theory you just read, you will get the answer because questions are based on the theory you just read..