Sound Flashcards
(18 cards)
What is sound energy caused by?
It is caused by vibrations and this motion is turned into sound energy.
What is a vibration?
A vibration is a fast, backwards and forwards movement that repeats many times.
What is the speed of sound in air?
330 M/s
What is the speed of sound in water?
1500 m/s
How do calculate speed?
Speed equals distance divided by time
Why do you see lightning before you hear thunder?
Light travels faster than the speed of light.
What are frequencies measured in?
It is measured in hertz or kilohertz
What is a time period?
It is the time taken for one complete vibration to happen.
What device turns sound energy into electrical energy?
A microphone
What does a CRO do?
It shows the electrical signal on the screen
How do you measure the size of vibrations?
By measuring its amplitude.
What is an echo?
An echo is a reflected sound
where is an echo best heard?
in a large space
What does SONAR stand for?
Sound navigation and range
What is the lowest frequency you can hear?
20 hertz
What is the highest frequency a human hear?
20000 hertz
What is the threshold of hearing?
It is the faintest sound a human can hear.
What is a way to prevent noise related hearing loss?
the 60/60 rule.
