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
