All waves need some materials to travel through.
True
False
Electromagnetic radiation is
Energy that is created only by the Sun
Energy that is created by atoms and electricity
Energy that is electric and magnetic
Energy that is magnetic and solar
EM waves have crests, troughs, and wavelengths.
True
False
Radio waves:
Are the shortest waves in the EM spectrum
Need water to travel through
Are the longest waves in the EM spectrum
Carry the most energy in the EM spectrum
What does frequency mean?
How many waves or cycles exist at one time
How many waves or cycles pass a certain point in one minute
How many waves or cycles pass a certain point in one second
How many waves or cycles pass a certain point in one hour
A cycle measures:
1 point
How long the wavelength is
How much time it takes the wave to travel from its source to Earth
The number of waves passing a certain point in one second
A single wave from one crest or trough to the next
Another word for cycles per second is ___.
Hertz
Frequency
EM radiation
Waves
Which waves have the highest frequencies?
Microwaves
UV
Waves with the highest energy
Waves with the lowest energy
Radio waves are used for ________.
TV broadcasting
Cell phones
Pagers
All of the above
In general, if a wavelength is short, __________.
It tells us nothing about the energy and frequency
The energy and frequency are medium
The energy and frequency are high
The energy and frequency are low