Physics2 7L Sound Flashcards
What is sound caused by?
Sound is caused by vibrations.
What does ‘pitch’ mean?
The word ‘pitch’ means how high or low the note is.
Is a high pitch note a low frequency or a high frequency?
A high pitch note is a high frequency?
What is meant by the ‘frequency’ of a sound wave?
The ‘frequency’ of a sound wave means how frequently the vibrations happen.
High frequency = high pitch note.
It is literally the number of vibrations per second.
Which of these bars on the xylophone would produce the lowest pitch note?
The lowest pitch note is produced by the longest bar.
What’s the word used to describe how loud a sound is?
The word used to describe how loud a sound is, is volume
When sound travels through the air, what is it that’s vibrating?
When sound travels through the air, it is the air particles that are vibrating.
Why will sound not travel through space?
Sound will not travel through space because space is a vacuum and there is no air for the sound to travel through.
What unit is frequency measured in?
Frequency is measure in Hertz (Hz)
Sound can travel through gases, liquids and solids.Which one does it travel fastest through?
Sound travels fastest through solids and slowest through gases.
Why does sound travel fastest through solids?
Sound travels fastest through solids because the particles are closest together in solids, so the vibrations can get passed on quicker.
Which part of the ear is labelled A?
A is the ear drum.
Which part of the ear is labelled B?
B is the cochlea.
What is part C of the ear made up from?
C is made up of tiny bones (the hammer, anvil and stirrup)
What is the function of part B?
Part B is the cochlea and its function is to change the vibarations into tiny electrical signals that get sent to your brain.
What is the function of part C?
Part C, the ear bones, amplify the vibrations and pass them on to the next part of the ear.
If a louder sound reaches your ear, what will happen to the ear drum?
If a louder sound reaches your ear the ear drum will vibrate more.
What is the lowest frequency that humans can hear?
The lowest frequency that humans can hear is around 20 Hz.
What is the highest frequency that humans can hear?
The highest frequency that humans can hear is around 20,000 Hz.
What is ‘ultrasound’?
Ultrasound is sound that is a higher frequency than humans can hear. that means sound above 20,000 Hz.
What is ultrasound used for?
Ultrasound can be used to scan inside the body e.g. a pregnant woman, and to relieve pain through physiotherapy.
What unit is used to measure the loudness of sound?
Loudness is measured in decibels (dB).
Why might your ears be damaged if you listen to loud music for long periods?
The loud music makes parts of your ear vibrate more. these large vibrations can damage your ear.
What’s an echo?
An echo is the reflection of a sound wave.
What could you do to stop your ears being damaged if you were using loud machinery?
To stop your ears being damaged if you were using loud machinery you could use ear protectors or use the machinery for less time.
Why does having lots of soft furniture in a room reduce the echoes?
Having lots of soft furniture in a room reduces the echoes because the energy of the sound wave (the vibrations) are absorbed by the soft furniture.
What is sonar, and what is it used for?
Sonar is sound waves that are sent through water.It is used to locate things like shoals of fish, other ships, or to measure the sea bed. It does this by measuring the echoes.
