Sound Waves Flashcards
(28 cards)
How are sound waves produced
Vibrating tuning forks
What is compression
A region of high molecular density and high air pressure
What is rarefaction
Region of low density and low pressure
What happens as the tuning fork vibrates
Compressions and rarefactions spread away from each prong
How do the air molecules move as the tuning fork vibrates
Simple harmonic motion
When the prong swings to the right it creates a region of
High density and pressure
When the prong swings to the left it creates a region of
Low density and pressure
Crests corresponds to
Compressions
Troughs corresponds to
Rarefactions
Sound waves are
Longitundal
Vibrations of air molecules in sound waves are parallel to
Direction of wave motion
Sine curve represents
Changes in air pressure due to propagation of sound waves
Number of cycles per unit
Frequency
Human frequency
20-20k Hz
Human frequency
20-20k Hz
Sound waves under 20 hz
Infrasonic
Sound waves above 20k hz
Ultrasonic
Dogs hear
Ultrasonic
What does the frequency of a sound wave determine
Pitch of a sound
What is pitch
Measure of how high or how low a sound wave is depending on frequency
What happens to the pitch as the frequency of a wave increases?
Pitch increases making the sound higher
How are sounds of different frequencies perceived?
Pitch, loudness and background noise
Sound travels faster through
solids
Sound travels slower through
gases
