# Shared Flashcard Set

## Details

Test 6
Chapter 15 notes
44
Physics
10/31/2015

Term
 pressure variation that is transmitted through matter
Definition
 sound wave
Term
 Why do sound waves move through air?
Definition
 a vibrating source produces regular variations (oscillations) in air pressure
Term
 Why is sound a longitudinal wave?
Definition
 the motion of particles in air is parallel to the direction of the wave's motion
Term
 What is the speed of sound at sea level and room temp?
Definition
 343 m/s
Term
 What is room temperature?
Definition
 20 degrees Celsius
Term
 Since the speed of sound depends on the temperature, how much does the speed increase for each one degree increase in temperature?
Definition
 0.6 m/s
Term
 Where is the speed of sound greater than in gases?
Definition
 solids and liquids
Term
 Why can't sound travel through a vacuum?
Definition
 there are no particles to collide
Term
 reflected sound waves
Definition
 echoes
Term
 the kinetic energy of vibrating air particles
Definition
 sound energy
Term
 What is a microphone which converts sound waves into electrical energy?
Definition
 a common sound detector
Term
 What is an example of a detector that receives pressure waves and converts them to electrical impulses?
Definition
 the human ear
Term
 What is the outer fleshy part of the ear?
Definition
 pinna (auricle)
Term
 Through which part of the ear is sound channeled?
Definition
 the auditory canal
Term
 Where does sound cause vibrations at?
Definition
 the tympanic membrane (eardrum)
Term
 What are the three smallest bones in the body?
Definition
 malleus, incus, stapes
Term
 Where do the three smallest bones in the body transfer vibrations to fluids?
Definition
 cochlea
Term
 The tiny hairs lining the spiral shaped cochlea detect what?
Definition
 certain frequencies in the vibrating fluid
Term
 What do the tiny hairs that line the cochlea do?
Definition
 stimulate nerve cells with send impulses to the brain (sound)
Term
 Who played a part in determining that the pitch we hear depends on the frequency of vibration?
Definition
 Galileo
Term
 What frequency does Middle C have?
Definition
 262 Hertz
Term
 What is the highest frequency most people can hear?
Definition
 8000 Hz
Term
 What is the measure of the variation in pressure along a wave?
Definition
 amplitude
Term
 What depends primarily on the amplitude of the pressure wave?
Definition
 the loudness of sound
Term
 What does 1 atm of pressure equal?
Definition
 1.01 x 10^5 Pa
Term
 The ear can detect pressure-wave amplitudes of less than what?
Definition
 one billionth of an atmosphere or 2 x 10^-5 Pa
Term
 What does 20 Pa of pressure-wave amplitudes do to a person?
Definition
 causes great pain
Term
 What is the unit of measurement for sound level?
Definition
 Decibel (dB)
Term
 What is the change in frequency of sound caused by movement of either the source, the detector, or both?
Definition
 Doppler Effect
Term
 What of an ambulance siren is higher as the vehicle moves toward you and then dropped to a lower pitch as the source moves away?
Definition
 pitch
Term
 In what process do bats use the Doppler effect to locate prey?
Definition
 echolocation
Term
 What do bats use for navigation?
Definition
 sound waves
Term
 What are some other uses of the Doppler effect?
Definition
Term
 What distorts the sound wave leading a sound source?
Definition
 motion of a sound source
Term
 What is it called when a sound source is moving faster than the speed of sound, a conical wave front?
Definition
 shock wave
Term
 What is speed faster than the speed of sound called?
Definition
 supersonic speed
Term
 What are several pitches played together?
Definition
 chord
Term
 What is an unpleasant set of pitches called?
Definition
 dissonance
Term
 What is a pleasant set of pitches called?
Definition
 consonance
Term
 Who believed that light is a stream of fast moving, unimaginably tiny particles with he called corpuscles?
Definition
 Newton
Term
 Newton's experiments showed that light also behaves like what?
Definition
 a wave
Term
 light is represented as a ray that travels in a straight path, and direction cold only by changed by placing an obstruction in the path
Definition
 ray model of light
Term
 Why was the ray model of light introduced?
Definition
 a way to study how light interacts with matter regardless of whether light is a particle or wave
Term
 What is the study of light called?
Definition
 ray optics
Supporting users have an ad free experience!