Question

PLZ HELP

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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Answer 1

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.)