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Sound energy (hearing sound (human ear ((goes to cochlea then ear nerves),…
Sound energy
hearing sound
sound occurs when a vibrating object disrupts the space around it.
this causes structures in the ears to vibrate
brain then interprets the info
human ear
external ear collects sound
ear canal moves sound to ear drum
goes to cochlea then ear nerves
transferred with 3 bones
hard surfaces reflect sound waves
compare sound
micro phone
height of peak is amplitude
higher amplitude-greater noise and greater vibration
oscilloscope
show wave patterns
pitch=frequency
higher frequency, higher speed of vibration
hertz
humans hear 20-20000 hertz
loudness
greater noise means greater vibration
decibels(dB)
sonar
ultrasound
use in medicine
noise pollution
sound navigation and ranging
through echoing sounds
must travel through medium
such as air
no sound in space or vacuum
e.g bell in jar, suck out air no sound
speed of sound
air
330m/s
die to the distance between atoms
solid
1500m/s
liquid
5000-6000m/s
waves
effects
reflection
reflected by the same angle as it strikes
refraction
change direction when passing
diffraction
bend around or spread out
equation
speed=frequency * wavelength
through vibrations
in a drum
vibrates the air molecules which then spreads