Sound Yr8 Flashcards
Pitch
How high or low a note sounds
Sound waves
Sound energy carried from one place to another in the form of waves.
Vibrate
Moving backwards and forwards
Microphone -
A device that detects sound. It converts sound energy into electrical energy.
Amplitude
Height of a wave
Wave length -
Length of one wave
Frequency -
How many waves per second
What does the amplitude show?
The volume
What does the frequency of a wave show?
How high or low a pitch is.
If the amplitude of a wave increases…..
….the volume becomes louder.
If the amplitude decreases………
…the volume becomes quieter.
If the frequency increases…
…the pitch because higher.
If the frequency decreases…
The pitch would become lower.
Is the crest in a wave at the top or bottom?
Top of a sound wave
Is the trough at the top or bottom of a wave?
The bottom of a sound wave.
How do sound waves travel?
Through particles.
What will sound travel through?
All the mediums: Gases, solids and liquids.
A vacuum doesn’t have particles so will sound travel through it?
No, because ….
What is the frequency measured in?
Hertz (Hz)
Will sound travel quickest through a solid or a gas?
Solid, because …
What is ultra sound?
Above 20,000 Hz
Humans can’t hear it because it is above our audible range
Dolphins and bats.
What is infra sound?
Below 20 Hz
Human as can’t hear it, it is beyond our audible range.
Elephants and moles.
Sound waves hit the…
Eardrum
Vibrations of the _______ pass onto tiny bones called…
..Ossicles in the middle of the ear.
These _________ transmit the vibrations to the ….
…cochlea in the inner ear.
Tiny hair cells in the ____________ help transmit sound signals through the ….
Auditory nerve to the brain.
Key word : intensity?
The loudness of a sound
