SOUND and ECHO LOCATION Flashcards
Define wave length
The distance between two consecutive points on a wave
Compare the difference in amplitude between a loud and a quiet sound.
The amplitude of a loud sound will be greater than the amplitude of a quiet sound
Which piece of equipment is used to display a wave on a screen.
Oscilloscope
Compare the difference in amplitude between a loud and a quiet sound.
The amplitude of a loud sound will be greater than the amplitude of a quiet sound
What is an area of high pressure known as in a sound wave?
Compression
What is the human range of hearing?
20 – 20 000 Hz
Describe the role of the ossicles.
These tiny bones amplify the sound in your ear so that the liquid in the cochlea can vibrate and convert the sound into signals which can travel to your brain
What are three ways in which hearing can be damaged?
A hole in the ear drum, the ear canal becoming blocked with wax, or very loud sounds
What is meant by ‘superpose’?
When waves either add up or cancel each other out
Explain why sound travels quicker in a solid than a gas?
The particles in a solid are closer together and so can pass on the vibrations more quickly than in a gas
What is an echo?
When a sound wave reflects off a surface
What are two uses of ultrasound?
Produce images of unborn babies (scans) and for sonar used on ships
How do dolphins communicate and navigate?
By echo location
What is the speed of sound (in gas)?
340 m/s
What is the speed of sound (in liquid)?
1500 m/s
What is the speed of sound (in solid)?
5000 m/s
What is the speed of light?
300,000,000 m/s (300 Million)
What is the range of human hearing and what is it called?
Audible range (20-20,000)
what does sound need to travel?
They need molecules to travel
What can sound not travel through?
Sound cant travel through a vacuum
what is ultra sound
sound over 20,000 Hz
what is infrasound?
sound under 20 Hz
how many hertz (Hz) in a kilohertz (Khz)?
1000 Hertz (Hz)
What is sound measured in?
Sound is measured in decibels (10x)
