Electromagnetic waves are used extensively in modern wireless technology. Many devices are built to emit and$/$or receive EM waves at a very specit examples followed by their frequencies of operation

garage door openers: $40\mathrm{.}0$ MHz

standard cordess phones $40\mathrm{.}0$ to $50\mathrm{.}0$ MHz

baby monitors $49\mathrm{.}0$ MHz

FM radio stations: $88\mathrm{.}0$ to $108$ MHz

cell phones $800$ to $2100$ MHz

Global Positioning System $1227$ to $1575$ MHz

microwave ovens $2450$ MHz

wireless local area networks: $2\mathrm{.}4$ GHz and $5\mathrm{.}0$ GHz

Part B

Which of the following statements correctly describe the various applications listed above?

Check all that apply.

View Available Hint$($s$)$

None of these technologies use radio waves.

Nope of these technologies use lower$-$frequency microwaves.

None of these technologies use higher$-$frequency' microwaves.

None of these technologies use infrared waves.

The radiation emitted by some wireless local area networks has the shortest wavelength of all the technologies listed above.

All these technologies emit waves with a wavelength in the range $0\mathrm{.}01$ to $10\mathrm{.}0$ km $.$

All these technologies emit waves with a wavelength in the range $0\mathrm{.}01$ to $10\mathrm{.}0$ m