# Shared Flashcard Set

## Details

Hearing Science
Professor Stiritz, Exam 1
21
Audiology
Undergraduate 3
01/30/2013

## Cards Return to Set Details

Term
 Sound as a psychological sensation
Definition
 A compressional wave that produces a SENSATION IN THE HUMAN EAR.
Term
 Sound as a physical perspective
Definition
 Reference to properties of the SOURCE of what we call sound and the properties of a medium in which these sounds are emphasized.
Term
 What two properties are required to transmit vibration?
Definition
 Mass (m) & Elasticity (E)
Term
 Mass (m)
Definition
 The amount of matter present    Applies to Gases, Liquids, & Solids   **Mass is NOT the same as weight
Term
 Scalar
Definition
 any property that can be characterized by ONE number.   (EX: Time, Mass, Distance)
Term
 Vector
Definition
 Any property that can be characterized by two numbers   (EX: Speed is measured in mph) Has both magnitude & direction   Other exampled of Vectors: Veloctiy, Acceleration, Displacement
Term
 Newton's First Law (Law of Inertia)
Definition
 All bodies remain at rest or in a state of uniform motion UNLESS another force acts in opposition.    In other words... The tendency of a body in motion to remain in motion & the tendency of a body at rest to stay at rest
Term
 Density
Definition
 Mass per unit volume   Ex: 4 air molecules (LESS DENSE) 4 million air molecules (MORE DENSE)   *Density changes how air molecules travel*
Term
 Weight
Definition
 Refers to the attractive gravitational force exerted on a mass by the earth   Weight of an object is DIRECTLY proportional to its mass.   Weight is a FORCE, not a quantity of matter present.
Term
 Elasticity (E)
Definition
 The property that enables recovery from distortion to either shape or volume   More properly defined as: "The ability to resist changed in shape or volume rather than the ability to recover from such changes"
Term
 Elasticity
Definition
 Measured in Stiffness and is seen when force is applied to an object
Term
 Inertia
Definition
 The main property adressed in Newton's First Law   Inertia is DIRECTLY proportional to mass    Think of mass as a measurement of Inertia-   Compare a Steel ball with Ping Pong Ball (A massive object like the steel ball, a large force is needed to set the ball into motion, stop its motion, or to change its direction. Unlike the steel ball, the ping pong ball has neglibible mass, therefore small inertia because little force is needed to set the ping pong ball into motion, stop motion, or change direction)
Term
 Displacement
Definition
 Movement from an original position caused by an application of force.    *The amplitude of displacement is PROPORTIONAL to the magnitude of force applied* (In other words, the harder we strike the fork, the greater the amplitude of displacement from equilibrium)
Term
 Newton's Second Law
Definition
 FORCE= MASS x ACCELERATION   (Acceleration being a VECTOR) (Mass being SCALAR)
Term
 Displacement VS Equilibrium
Definition
 Equilibrium: NO MOVEMENT    Net Force=0 Meaning NO forces are acting upon the specified object   Displacement: Movement from equilibrium caused by an acting force
Term
 Force
Definition
 If a force is applied and motion occurs, the motion is opposed by FRICTION.   Friction occurs when two surfaces are in contact whith each other.
Term
 Newton's THIRD Law
Definition
 With every force there must be associated an EQUAL reaction force of OPPOSITE direction.   A Force CAN NOT exist alone (This is why we can not play tug of war by oneself)
Term
 Example of Newton's Third Law
Definition
 Exerting a force on the desk with your hand.  The shape of your hand has been distorted because of the equal but opposite reacting force from the desk.   The reaction force exerted on your hand because the desk is elastic.   **ALL solid materials posess some degree of elasticity, therefore are able to exert forces.
Term
 Oscillation
Definition
 Another term for vibration    Two types of movement: 1) Transverse Wave 2) Longitudinal Wave
Term
 Transverse Wave
Definition
 Direction of the vibration is at a RIGHT angle to the direction of the force that propogated the vibration.   EX: Pebble dropped in water. (The force of the pebble is downward due to gravitational pull, causing the horizontal propagations of vibrations.)
Term
 Longitudinal Wave
Definition
 Direction of the oscilation (vibration) is PARALLEL to the force that propagated the motion.   EX: Spring on top of a screen door
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