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Why are they called “electromagnet” anyway?
There are actually 2 waves, one of the waves creates and electric field and the other wave creates a magnetic field.
How can EM waves travel through space to the Earth?
EM waves travel as transverse waves and do NOT need a medium to travel through.
Why are fluorescent bulbs better than incandescent?
Less heat, less energy, less money
What is the "Law of Reflection"?
The angle of the incoming wave is equal to the angle of the reflected wave.
In terms of waves, what are gas, liquid and solid collectively referred to?
media or medium
If the angle of incidence is 25 degrees, what will the angle of reflection be?
25 degrees
What does opaque mean?
Light is either reflected or absorbed, but does not go through
Why do hospitals have UV lights / blacklights by all of the doors?
to kill bacteria
The ________ layer blocks some of the harmful UV radiation from the sun.
ozone
The light that we see from stars in the night sky is one type of __________ wave
electromagnetic
All of the following are parts of the EM spectrum EXCEPT...
ultrasound
If light waves change speed when they pass from one medium into another, the light will be ________
refracted
_________ is the bending of waves around a barrier.
Diffraction
The wavelengths of ________ are slightly longer or wider than those of visible light.
infrared radiation
What is the amplitude of the node of a wave?
zero
What is a laser?
A concentrated beam of light that has only one frequency and does not spread out
Name THREE of the SIX types of waves that make up the electromagnetic spectrum.
Radio, infrared, visible light, ultraviolet, x-ray, gamma
How are rainbows made?
Light from the sun is refracted by water in the atmosphere
Electromagnetic waves....
transfer energy.
X-rays are best absorbed by...
bone
Fluorescent bulbs glow when the phosphorous coating on the inside of the tube absorbs...
UV radiation
Your body gives off...
infrared radiation
Objects that partially scatter light that passes through them are called...
translucent
EM waves with the longest wavelengths are...
gamma rays
The image produced by a concave lens is always...
Smaller than the object
Light bends when it passes at an angle from air into water because the water...
slows down the light
When light rays bounce off a surface, it is called...
reflection
A material that you can see clearly through is...
transparent
The visible light portion of the spectrum is found in between:
infrared and ultraviolet
Heat lamps give off _________ rays.
infrared
What two properties of EM waves change from left to right on the diagram of the EM spectrum:
frequency and wavelength
One Hertz (Hz) is equal to what?
The number of complete waves or cycles that pass a point each second
What is the height of a transverse wave called?
Amplitude
The higher the frequency of an EM wave, the more __________ it has.
energy
Ultraviolet rays...
help the body make vitamin D
Which color of visible light has the longest wavelengths?
Red
EM waves with the lowest frequencies are:
x-rays
All electromagnetic waves:
Travel at the speed of light
The energy carried by an electromagnetic wave is called:
Electromagnetic radiation
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