Chapter 11 Flashcards
Waves
Vibrations set in motion and a way to transmit energy from one location to the next
Wavelength
The distance between any two repeating parts of a wave
Amplitude
How strong the wave or sound is also 1/2 the height of the wave
Translational wave
Has crests and troughs
Compression waves
Need a medium to travel through such as air or water
Frequency
The number of wave cycles that pass any one point per second
What speed do electromagnetic radiation waves travel at
300,000 km/sec it 186,000miles/sec
Speed of sound in air vs water
4xs faster in water
Air= 1,100ft/s
Water=4500ft/s
Reflection
A wave bounces off another object
Refraction
The bending of the direction of a wave as it moves from one medium to a different medium
Diffraction
Causes wave to spread out evenly when opening is the same size as the wavelength
Three types of interference
Partial destructive, complete drestructive, constructive
Constructive interference
Increase in amplitude. Two waves come together. Crest+crest= huge wave
Destructive interference
Waves collide trough to crest and it cancels the amplitude out
Partial destructive interference
Shape of wave is distorted but not destroyed
Sound
All hearing is compression of air then relaxing
Musical instruments are based on
Standing waves
3 loops in ear and what they do
Semicircular canals they control balance and coordination
Unit to measure how strong a sound is
Decibel (dB)
Damage to ears happens at
100 decibels
SONAR
Sound Navigation and Ranging
