# Shared Flashcard Set

## Details

Waves
Miller CCHS Physics
37
Physics
11/13/2009

Term
 What does the amplitude of the wave determine?
Definition
 The amount of energy in a wave.
Term
 What is a Pulse?
Definition
 A single wave bump.
Term
 If the vibration is sinusoidal, what form are the waves?
Definition
 The waves are also sinusoidal because waves are caused by vibrations.
Term
 What type of wave has particles that move perpendicular to the motion of the wave?
Definition
 Transverse Waves
Term
 What type of wave has particles that move in the same direction as (parallel to) the motion of the wave?
Definition
 Longitudinal Waves
Term
 Draw and Label Crest, Trough, Wavelength, and Amplitude of a Transverse wave.
Definition
 [image]
Term
 Draw and Label compression, rarefaction, and wavelength of a longitudinal wave.
Definition
 [image]
Term
 What is the velocity of a wave?
Definition
 The velocity at which the crests move.
Term
 What occurs when two waves pass through the same region of space at the same time?
Definition
 Interference.
Term
 What is superposition?
Definition
 When two waves overlap the resultant displacement is the algebraic sum of their seperate displacements.
Term
 What causes constructive interference?
Definition
 When the resultant displacement is greater than either pulse.
Term
 What causes destructive interference?
Definition
 When the resultant displacement is less than that of either pulse.
Term
 What is Boundary Behavior
Definition
 Behavior of a wave upon reaching the end of a medium.
Term
 What happens when a wave reaches a boundary between two mediums? Does the frequency change?
Definition
 Part of the wave is transmitted and part of it is reflected. The frequency NEVER changes.
Term
 What is the incident pulse?
Definition
 The pulse in the initial medium approaching the boundary.
Term
 What is the pulse that returns in the initial medium after bouncing off the other medium?
Definition
 The reflected pulse.
Term
 When is the speed of the reflected pulse the same as the speed of the incident pulse?
Definition
 During fixed end reflection.
Term
 How do the wavelength and amplitude of the reflected pulse compare to that of the incident pulse in fixed end reflection?
Definition
 the wavelength of the reflected pulse is the same as the wavelength of the incident pulse, but the amplitude of the reflected is less than the amplitude of the incident.
Term
 What is the difference between free end and fixed end reflection?
Definition
 In fixed end the reflected pulse is inverted and in free end, the reflected pulse is not.
Term
 From a LESS dense medium to MORE dense, how does the speed of the transmitted pulse compare to the reflected pulse?
Definition
 The transmitted pulse is traveling SLOWER than the reflected pulse.
Term
 From a LESS dense medium to MORE dense, how does the wavelength of the transmitted pulse compare to the reflected pulse?
Definition
 The transmitted pulse has a SMALLER wavelength than the reflected pulse.
Term
 From a LESS dense medium to MORE dense, how does the speed of the transmitted pulse compare to the reflected pulse?From a less dense medium to more dense, how does the wavelength of the transmitted pulse compare to the INCIDENT pulse?
Definition
 Speed is slower, wavelength is shorter.
Term
 From a LESS dense medium to MORE dense, which pulse (transmitted or reflected) are on the opposite side (out of phase) as the incident phase?
Definition
 The reflected pulse.
Term
 From LESS dense medium to MORE dense, which pulse (transmitted or reflected) is on the same side (in phase) as the incident phase?
Definition
 The transmitted pulse
Term
 From a MORE dense medium to LESS dense, how does the wavelength of the transmitted pulse compare to the reflected pulse?
Definition
 The transmitted pulse has a LARGER wavelength than the reflected pulse.
Term
 From a MORE dense medium to LESS dense, how does the velocity of the transmitted pulse compare to the reflected pulse?
Definition
 The transmitted pulse is FASTER than the reflected pulse.
Term
 From a MORE dense medium to a LESS dense, which pulse (transmitted or reflected) are on the opposite side (out of phase) as the incident phase?
Definition
 the transmitted pulse and the reflected pulse
Term
 Is the wave speed greatest in the least dense or most dense medium?
Definition
 The least dense.
Term
 Is the wavelength the greatest in the least dense medium or the most dense medium?
Definition
 The least dense medium.
Term
 Is the amplitude of the incident pulse greater or smaller than the amplitude of the reflected pulse?
Definition
 The amplitude of the incident pulse is always greater than the amplitude of the reflected pulse.
Term
 What two factors are the speed of waves dependent on?
Definition
 Tension and Mass/length (acceleration/speed increases when tension increases, mass decreases, and length of string decreases)
Term
 Give an example of how to form a standing wave?
Definition
 If you shake one end of a cord and keep the other end fixed - results in a continuous wave that travels down to the fixed end and is reflected back, out of phase.
Term
 In a standing wave, which direction do the waves travel?
Definition
 Both directions.
Term
 What are two special results that occur if you shake a cord at a specific frequency?
Definition
 A standing wave, and creation of a node.
Term
 What are nodes?
Definition
 Points of destructive interference that result in minimum (zero) amplitude.
Term
 What is an antinodes?
Definition
 Points of constructive interference (max amplitude)
Term
 What is the wave equation for the velocity of a wave using frequency.
Definition
 [image]
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