1
What causes sound?
Vibrations in matter.
What produces the sound in a loudspeaker?
An electrical signal from a computer / Vibrations in the membrane of the speaker.
A guitar string vibrates 30 times in 15 seconds. What is its frequency?
2 Hz
What is loudness?
Volume. How loud or soft a sound is
If you increase the volume on a loudspeaker, how do the vibrations change?
They get bigger.
A string vibrates at a frequency of 50Hz. How many times does it vibrate in 5 seconds?
250 times
What is an oscilloscope used for related to sound?
To visualise (see) sound waves.
What is pitch?
How high or low a note is
If you increase the pitch on a loudspeaker, how do the vibrations change?
They get faster.
What is the unit for frequency?
Hertz
What state of matter does sound travel through the slowest and why?
Gas, because particles are far apart
What is the speed of sound in air?
Around 330 m/s
What produces the sound in a guitar?
The vibrations in the guitar string
Loudness corresponds to what measurement on a wave?
Amplitude
Draw a high pitched sound.
Mr. Coathup will check.
What is the speed of sound in water?
Around 1450 m/s
What produces the sounds when we speak?
Our vocal chords (in our throats)
Pitch corresponds to what measurement on a wave?
Frequency
Draw a low pitched sound.
Mr. Coathup will check.
Which sound would you hear first: A person yelling across a room OR A person speaking through a string and cup. Explain your answer.
String because it is a solid and sound travels fastest through solids.
What is the speed of sound in steel?
Around 6000 m/s