1G Sound & Light
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What is the ‘amplitude of a wave’?
The distance from the centre of the wave to a crest or trough.
What happens to a sound if the amplitude increases or decreases?
The sound gets louder or quieter.
What is the highest point of a wave called?
The crest
What is the lowest point of a wave called?
The trough
What do we call the distance between the crest of one wave and the crest of the next wave?
Wavelength
The number of waves that occur in 1 second is known as….
Frequency
What is the equation for calculating average speed?
d = vt
What type of wave is sound carried by?
Longitudinal wave
What causes sound?
An object vibrating causes sound. It causes air particles around it to vibrate too.
Why is there no sound in space?
Space is a vacuum/there are no particles to vibrate.
Do particles move down a sound wave?
No the sound ENERGY moves along a wave but the particles vibrate around a fixed point.
What is the speed of sound?
340m/s
When would we describe an object as ‘Luminous’?
If it emits it’s own light e.g. the sun
What happens to a sound if you shorten the wavelength and increase the frequency?
It changes the pitch of the sound (makes it higher).
What type of wave does light travel as?
A Transverse wave.
What is the ‘Law of Reflection’?
The angle of incidence is equal to the angle of reflection.
What is the incident ray?
The ray of light before it hits a surface.
In reflection and refraction experiments using a mirror. What is the normal line?
An imaginary 90o angle to the surface of the mirror.
What is the angle of incidence?
The angle between the incident ray and the normal line
What is the angle of reflection?
The angle between the reflected ray and the normal?
If the angle of incidence is 40°, what is the angle of reflection? Why?
40°, because the angle of incidence is always equal to the angle of reflection
What is a reflected ray?
The ray of light travelling away from a surface/mirror