Question

Select the statement(s) that accurately describe common uses and applications of the longer wavelengths of the electromagnetic spectrum.

To study outer space.

To talk to a friend on a cell phone.

To see colors.

To change the channel on the television with a remote control.

To make toast in a toaster.

Answer 1

Correct:
- To study outer space. (Astronomers use long wavelengths like radio and microwave astronomy.)
- To talk to a friend on a cell phone. (Cell phones use radio/microwave frequencies.)
- To change the channel on the television with a remote control. (Most remotes use infrared light, which is longer wavelength than visible.)

Incorrect:
- To see colors. (Color is from visible light, which is shorter wavelength than the "longer" end.)
- To make toast in a toaster. (Toasters use resistive heating elements; microwaves (a longer wavelength) heat food in microwave ovens, but regular toasters do not use radio/microwave/IR as their primary mechanism.)