Sound Flashcards
Waves
Vibrations set in motion
A way to transmit energy from one location to the next
Wavelength
Distance between any two repeating parts of a wave
Translational waves
Have crests and troughs (looks like normal waves)
Compression waves
Need a medium to travel through like air or water
Places where the waves are spread apart vs close together
Apart- ratification
Close- areas of compression
Frequency
Number of wave cycles that pass any one point per second
Hertz=1 wave cycle per second
10 hertz= 10 wave cycles per second
Wave speed =?????
Wave speed = wavelength x frequency
300m. = 100 m. x. 3 cycles
All electro,agnetic radiation from radio waves travel at
300,000 km per second
Speed of sound in air vs water
Air- 1,100 ft per second
Water- 4,500 ft per second
Reflection
When a wave bounces off something
Angle of incidence vs angle of reflection
Incidence is up top and reflection is bottom
Refraction vs diffraction
R- the bending of a wave as it moves to one medium to another (straw in water looks demented bc light waves are going from air to water)
D-causes waves to spread out evenly when opening is the same size as wave length
Constructive vs destructive interference
C- increase in amplitude when two waves come together
D- waves collide trough to crest and it cancels the amplitude out
Doppler effect
Pattern of sound waves spread out & when the object making the sound is moving the waves are different (ambulance)
If plane goes faster than speed of sound it’s a bunch of circles sorta over lapping
Boat example
V shape behind boat is constructive/destructive interference of waves
Sonar
Sonar bonds depend of temperature of water
Submarines try to find thermal layers where sonar can’t go
100 decibel
Damage to ears
Amplitude
Half the height of a wave
