Sound Flashcards
How do instruments make sounds?
When an AIR COLUMN vibrates
When a STRING vibrates
When you HIT them
When a SKIN or a METAL BAR vibrates
What makes a higher note in a string
The shorter
The tighter
The thinner
How does sound travel
Longitudinal wave
Long-it-udinal
Sound can only travel if?
There are particles to vibrate against
How does sound travel in
Solids
Liquids
Gasses
Very well
Fairly well
Poorly
Can sound go through a vacuum?
No because there are no particles to vibrate against
About how many m/s does sound travel in
Metals
Water
Air
6000m/s (fastest)
1500m/s (medium)
330m/s (slowest)
What travels faster: light or sound
Give an example
Light
Thunder and lightning
How fast does light travel in space?
300,000,000 m/s
How fast does sound travel in air?
330m/s
What is an echo?
An echo is a reflection of sound from a hard surface
What does frequency mean?
What is it measured in?
How many waves per second.
Hertz (Hz)
A loud sound carries a lot of..
Energy and has a big amplitude
The amplitude is half the total height of the wave
What’s the limit of our hearing?
20Hz-20,000Hz
What is a sound over 20k Hz?
Ultrasound
What vibrates in your ear?
The ear drum vibrates with the sound and that vibrates the osscicles.
What moves in the ear that gives an electrical signal?
Tiny hairs move in the cochlear witch convert into a electrical signal that passes along the auditory nerve
What units are sound levels measured in?
Decibels
What should you be given in a noisy environment and why?
Ear defenders, because loud sounds caused by aircraft, machinery etc, can damage our ears.
What is a sound wave?
A vibration that travels through a solid, liquid or gas.
A loud sound has a?
Large amplitude
A high pitched sound has a?
High frequency
The loudness of a sound depends on?
How big the vibration of the air is.
