| Term 
 | Definition 
 
        | the number of repetitions in a given interval of time |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | Unit of measurement for frequency |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | Longitudinal waves produced by the vibration of a material |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | perception of the intensity of sound |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | how high or low sond frequencies appear to be |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | consisits of a body suspended by from a fixed support so that it swings freely back and forth under the influence of gravity |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | straight line used to represent a light wave |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | all the colors of the spectrum visible to the human eye as a single color |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | the bouncing back of a wave when it hits a surface through which it cannot pass |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | the change in velocity and apparent bending of the beam of light or other wave-form as it passes from one medium into another |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | the bent light ray after the wave enters a medium |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | a line drawn perpendicular to the surface at the point where the incoming wave strikes the surface |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | a form of electromagnetic radiation with a wavelength visible by the eye |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | the angle between the normal (perpendicular drawn to the surface) and the reflected ray |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | the wave of light moving towards the surface at an angle |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | the angle between the normal (perpendicular drawn to the surface) and the incident ray |  | 
        |  |