1st
Cell phones depend on both mechanical and electromagnetic waves to be useful. Which answer below correctly identifies how each wave is used in cell phones?
Correct option
Mechanical waves allow the cell phone to emit a sound when ringing; Electromagnetic waves allow a signal to be picked up when making a call.
(Mechanical waves, made by oscillating a membrane inside the phone are responsible for sound. While electromagnetic waves, such as radio signals, allow us to make phone calls)
2nd
True or False. The Electromagnetic Spectrum can be described in terms of wave energy, frequency, and wavelength.
Correct option
True because the electromagnetic spectrum is ordered based on wave energy, which is described on a wave as wavelength and frequency.
(These are the basic characteristics of an electromagnetic wave, and depending of the frequency, they carry an specific amount of energy.)
