Waves and Hearing Flashcards
What happens when a wave propogates
It passes obstructions and obsticles
What do waves exhibit
common and predictable behaviors
What the law of reflection
The angle of incidence equals the angle of reflection
What is the incident ray
The ray approaching the mirror or reflective surface
What is the reflected ray
The product of the incident ray reflecting of a mirror or reflective surface
What is the normal line
A line perpendicular to the reflective surface
What is the angle of incident
The angle the incident ray makes with the normal line
What is the angle of reflection
The angle the reflected ray makes
What is refraction
When waves pass through to a different medium, they change direction-if the wave velocity is different in the two mediums
What is the percentage of speed glass takes away from light
66% slower
What is the speed of light in air
300,000,000 m/s
What is the speed that light travels in water
225,000,000 m/s
What is the speed of sound in air
342 m/s
What is the speed of sound in water
1,480 m/s
What happens when sound enters water
It refracts away from the normal line
What happens when light enters water
It refracts toward the normal line
What is the basic principle for refraction
Waves refract toward the normal line when they slow down and way from the normal line when they speed up
What is a ghost image
an after reflection of light
What is defraction
When waves bend and spread out as they pass by corners of objects in their paths
What is a waveleangth
The distance between the crests and the troughs of a wave
What is the SI system unit that measures frequency
Hertz and KiloHertz
What is X-Ray Crystallogaphy
When ultrasonic waves pass though a crystal and bounces of different components helping scientists find the structure of small things
Who invented X-Ray Crystallography
Max von Laue in 1912- Nobel prize in 1914
What is the range of human hearing
20 Hz to 20 kHz
What is the range of younger peoples hearing
15 Hz to 20 kHz
What is echolocation
Using ultrasonic waves to map suroundings
What is the range of a bat sounds
14 kHz to 100 kHz
What is sonar
using ultrasonic waves to map surroundings with boats and technology
What are ultrasonic waves
Waves above the range of human hearing
What are shock waves
Waves produced by an object traveling faster than the speed of sound
Who took the photo of a bullet moving
Ernst Mach (Name now used to designate speeds faster than the speed of sound) 1888
What is the Doppler effect
When an sound you is compressed by a moving object ad the pitch increases and decreases as it gets closer and farther away
