a) They are a type of electromagnetic radiation.
b) They are a type of sound waves.
c) They are a type of radio waves.
d) They are a type of visible light waves.
Answer: a) They are a type of electromagnetic radiation.
a) They are a type of electromagnetic radiation.
b) They are a type of sound waves.
c) They are a type of radio waves.
d) They are a type of visible light waves.
Answer: a) They are a type of electromagnetic radiation.