1) Under ideal conditions, a person with good hearing can hear sounds as low as 20 hertz or as high as __ hertz

-40,000

-60,000

-10,000

-20,000

2) Typical wavelengths for radio waves are 3 meters for FM stations and __ meters for AM stations,

-0.3

-30

-300

-3,000

3) Arises when two continuous waves, usually with the same amplitude and frequency arrive at the same place.

- reflection

-refraction

-diffraction

-interference