Sound Flashcards
Define sound
Sound is a longitudinal wave travelling in a medium, created by a vibrating source
What are compressed regions called
Compressions
How is sound propagated
- Vibration of a source is passed on to the medium particles
- This causes alternate regions of particles to be compressed and extended
In a displacement-distance graph, where are the centres of compression and rarefactions
Displacement zero
What are extended regions called
Rarefactions
In a pressure-distance graph, where are the centres of compressions and rarefactions
Amplitudes
What is pitch affected by
Frequency
Which medium does sound travel the fastest in
Solids
Why can sound not travel through a vacuum
Sound needs a medium to propagate from one point to another
What is loudness affected by
Amplitude
Define an echo
An echo is the repetition of a sound due to the reflection of sound
What are some applications of ultrasound
- Imaging internal organs
- Pre-natal scanning
- Breaking up kidney stones and cancer treatment
Define ultrasound
Ultrasound is sound with frequencies above the upper limit of the human audibility range
