Question

The temperature of water at the bottom of a large waterfall is generally higher than that of the water at the top, because

• A. the falling water absorbs heat from the sun
• B. the KE of the falling water is converted into heat
• C. the water at the bottom has greater PE
• D. rocks on the bed of the river give out heat

Answer 1

The correct option is B the KE of the falling water is converted into heat

Water is slightly warmer at the bottom of a waterfall than at the top because the gravitational potential energy is converted first to kinetic energy of the falling water, and finally to heat energy as it comes to rest at the bottom.