AP Physics 1 : Harmonics and Standing Waves
Study concepts, example questions & explanations for AP Physics 1
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Example Questions
Example Question #61 : Waves
What is the wavelength produced on the third harmonic of a 
The formula for wavelength depending on the harmonic is as follows:
Where 
Therefore the correct answer is 
Example Question #11 : Harmonics And Standing Waves
Suppose that a pipe open at one end supports a wave whose wavelength is 
To answer this question, we need to understand the concept of standing waves. A standing wave is a wave that exhibits both nodes and antinodes. A node is a fixed position where there is no displacement from the wave, and an antinode is a point of maximum displacement of the wave.
A standing wave can result from two individual waves traveling in opposite directions and interfering with each other. For instance, when a wave traveling through one medium (such as the air in the pipe) hits an interface that is denser (such as the end of the pipe), the wave will reflect back. However, this reflected wave will be shifted 
To solve this question, we need to use the expression for a pipe closed at one end and open at the other.
With this expression, we just need to plug in the values given to us in the question to solve for the length of the pipe.
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