Sound waves
What is a sound wave?
Energy that travels through matter.
What does the amplitude of a sound wave show?
The loudness.
How do electromagnetic waves transfer energy?
As radiation from the source to the absorber.
What is the law of reflection?
The angle of incidence is the same as the angle of reflection.
Which colours is visible light made up of?
Red, orange, yellow, green, blue, indigo and violet.
How are sounds made?
When an object vibrates.
What does the frequency of a sound wave show?
The pitch of a sound.
How does light travel?
In straight lines as a transverse wave at right angles to the direction of travel.
Which is the incident ray?
The light ray going towards the mirror.
What happens if there is a red filter in front of an object?
It will show RED
What is a longitudinal wave?
A wave that oscillates (moves) parallel to the wave (in the same direction that it travels).
What is frequency measured in?
Hertz.
What is a translucent material?
A material that will allow some light through but you cannot see clear shapes.
Which is the reflected ray?
The light ray going away from the mirror.
What happens if there is a green filter in front of an object?
It will show BLACK
Sound waves have areas of compression. What does this mean?
Regions where particles are close together.
What is a transverse wave?
A wave that oscillates (moves) at right angles to the direction of travel.
What is a transparent material?
A material that will light to pass through.
Define refraction.
When light waves change direction when going through a material with a different density.
BONUS: Explain the difference between a transverse and a longitudinal wave.
a transverse wave is perpendicular (at right angles 90°) to the direction of the wave / energy transfer
a longitudinal wave is parallel to the direction of the wave / energy transfer
Sound waves have areas of rarefaction. What does this mean?
Regions where particles are spread out.
LIGHT WAVE Q.
What is an opaque material?
A material that will not let light through.
What are the 7 types of wavelengths (in order)?
1.Radio waves
2. Microwaves
3. Infrared
4.Visible
5. Ultraviolet
6. X-ray
7.Gamma rays
What happens when light passes through a more dense material?
It slows down and changes direction (angle of incidence decreases towards the normal).
Bonus: What part of the ear detects sound?
Ear drum