EM Waves

Question 1

How do microwaves work?

Answer 1

. In such ovens, the frequency of the microwaves
is selected to match the resonant frequency of water molecules so that
energy from the waves is transferred efficiently to the kinetic energy of
the molecules. This raises the temperature of any food containing water.

Question 2

Different animals are sensitive to different range of
wavelengths. Justify

Answer 2

• snakes can detect infrared waves,
• and the
  ‘visible’ range of many insects extends well into the utraviolet.