Physics

electromagnetic waves

The order of EM waves

Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, gamma rays.

What is the type of EM waves?

transverse wave

Do all waves travel at the same time through air or vaccum? If so, what’s the speed?

Yes. They all travel at 3×10^8 m/s.

Describe the energy, wavelength and frequency of a wave as you go down the EM wave.

Wavelength decreases, energy increases, frequency increases.

what does wave need to transfer energy

a source and an absorber

What are EM waves made up of?

oscillating electric and magnetic fields

Uses of Radio waves

communication, television and radio signals

Why is radiowaves suitable for its use?

It can travel through long distance in the air and their longer wavelengths means they can bend around obstructions

What are the hazards of radio waves and microwaves?

they can penetrate the body and cause internal heating

what do radio waves do when they are absorbed?

they may create an alternating current with the same frequency as the radio waves

how are radio waves produce

oscillations in electrical circuits

what are radio raves reflected by

ionosohere

can microwaves pass through the atmosphere and if so how does it link to its uses (mention the use of microwaves)

YES, they pass through the atmosphere. Its uses are satellite communications and cooking food.

How does microwaves heat food?

microwaves penetrate into food and are absorbed by water molecules in food, heating it.