stationary waves Flashcards
What is a stationary wave?
two progressive waves with the same frequency and wavelength interfere with each other by moving in opposite directions
What is the energy output of a stationary wave?
none (neutral)
What is a node?
points on a stationary wave that have zero amplitude.Zero amplitude means that they are stationary
What is an antinode?
Antinodes are stationary waves with maximum amplitude.They oscillate from the highest point to the lowest point
At what frequency can stationary waves only take place?
Resonance frequencies
How do resonant frequencies happen?
when the distance between the two fixed ends is an integer multiple of half wavelengths, ½λ
What is the first resonance frequency called?
the first harmonic, F0 (also known as the fundamental)
how does the first harmonic occur?
It happens when the distance between the two fixed ends is exactly ½λ
How many nodes and antinodes does the first harmonic have?
2 nodes, 1 antinode
what is the second resonant frequency known as?
the second harmonic
How does the second harmonic occur?
It happens when the distance between the two fixed ends is exactly λ.
how many wavelengths does the second harmonic
It contains two ½λ lengths
How many nodes and antinodes are there in the second harmonic?
three nodes, two antinodes
What is the third resonant frequency called?
the third harmonic
When does a third harmonic occur?
It happens when the distance between the two fixed ends is exactly 1½λ.
