Front

Energy used by a portable lamp to produce light?

Back

Electrical energy, because the lamp is battery-operated.

Front

Each activity requires which kind of energy?

Back

Mechanical

Front

Yosemite National Park image shows:

Back

Light is reflected off the smooth surface of the lake.

Front

Child in pool: Why does the lower part look different in size?

Back

Light rays traveling from air into water are refracted.