Plz

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?

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 allow a signal to be picked up when making a call; electromagnetic waves allow the cell phone to emit a sound when ringing

mechanical waves light up the screen; electromagnetic waves create the sound when the phone is ringing

mechanical waves allow the buttons to be pressed to make a call; electromagnetic waves allow a signal to be picked up when making a call

true or false. the electromagnetic spectrum can be described in terms of wave energy, frequency, and wavelength.

question 4 options:

true because energy, frequency, and wavelength are all properties of sound, and sound is an electromagnetic wave.

false because the electromagnetic spectrum is about radiation, not waves.

true because the electromagnetic spectrum is ordered based on wave energy, which is described on a wave as wavelength and frequency.

false because energy, wavelength, and frequency are only characteristics of mechanical waves.

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