12.4-12.6 Stationary Waves Harmonics Quizlet Cards Flashcards
What are the condition required for a stationary wave to form?
Two waves travelling/propagating in opposite directions superpose with the same frequency and similar amplitudes
What is an anti-node on a stationary wave?
A point where the progressive waves are in phase and constructively interfering resulting in maximum amplitude
What is an node on a stationary wave?
A point where the progressive waves are in antiphase and are destructively interfering resulting in minimum amplitude
How many wavelengths are there between adjacent nodes of a standing wave?
Half a wavelength
What is the phase difference between points either side of a node?
Pi Rad/180 degrees
What is the phase difference of points between two adjacent nodes?
Zero
How does phase vary along a progressive wave?
Changes continuously across each wave cycle.
How does amplitude vary in a stationary wave?
It varies continuously along the wave. It is a maximum at antinodes and a minimum at nodes.
How does amplitude vary in a progressive wave?
It is the same at every point along the wave.
What type of wave doesn’t transfer energy?
Stationary waves
What is the fundamental frequency of a string?
The lowest frequency which produces a stationary wave on the string.
What factors determine the fundamental frequency on a string
Length, tension and the thickness of the string.
What determines the pitch produced by a stationary wave in a musical instrument?
The frequency of the 1st harmonic
What determines the loudness of sound?
The amplitude of the sound wave
Why can only certain frequency stationary waves be produced on a stretched string?
There must be nodes at the fixed ends and only certain frequencies/wavelengths allow this.
