P2a-Sound Waves Flashcards
What is an echo?
An echo is a sound going back and forth on an object.
What is the frequency of ultrasound?
The frequency of ultrasound is higher than 20,000Hz (hertz).
State two uses of ultrasound?
Seeing babies in the mothers womb and stopping certain types of cancer.
What are the different parts of the ear?
The eardrum, the pinna, the auditory nerve, the ossicles and the cochlea.
What is the humans audible range?
The humans audible range is roughly (depending on your age) 20-20,000Hz.
What produces a sound wave?
Vibrations cause a sound wave.
What is the speed of sound?
The speed of sound is 340m/sin air.
Name three types of medium that sound can travel through.
Gas, liquid and solid.
Copy and complete.
Sound is produced by objects that are……….. . This makes the air molecules………and produces a sound wave. Sound travels fastest in………..and slowest in…………, and it cannot travel through a…….. .
Sound is produced by objects that are vibrating. This makes the air molecules vibrate and produces a sound wave. Sound travels fastest in solids and slowest in gasses, and it cannot travel through a vacuum.
What is a longitudinal wave?
Is when the energy transfers parallel to the oscillation.
What is a transverse wave?
The oscillations are perpendicular to the directions in which the energy transfers.
