Waves 2 Flashcards
What 3 things could happen when waves meet a boundary
Totally or partially reflected
Transmitted through the substance
Absorbed by substance
What is sound caused by
Mechanical vibrations
What is an echo
When sound waves are reflected from hard flat surfaces.
What does the pitch of a note depend on
Depends on the frequency of the sound wave
How can we investigate waves
-Ripple tank for water waves
-loudspeaker for sound waves
What does the higher frequency of a sound wave mean
The higher the pitch
What does the loudness of a sound depend on
The amplitude of the sound wave
What range can human ears hear
20Hz to 20kHz
What is an ultrasound wave
Wave above 20kHz
Are ultra sound waves reflected at a boundary between two different substances
Partly reflected
How can you calculate the distance using ultrasound waves
Ultra sound waves reflected at a boundary are timed, the timing are used to calculate the distances
What is ultra sound used for
In medicine for scanning inside the body
What is a seismic wave
A wave that travels through the earth
What type of wave is a primary wave
Longitudinal
What type of wave is a secondary wave
Transverse