Lesson: Standing Waves

In this lesson, we will learn how to describe the structures of standing waves that can form by resonance with objects of different lengths.

Worksheet: 9 Questions

Q1:

A pipe that is open at both ends is 2.4 m long. What is the wavelength of a sound wave that has a frequency equal to the pipe’s fundamental frequency?

Q2:

A pipe is 75 cm long. Initially, one end of the pipe is closed, and a sound wave resonates in the pipe at the pipe’s fundamental frequency. The closed end of the pipe is then opened, and a new sound wave resonates at the open pipe’s fundamental frequency. What is the difference between the wavelengths of the two sound waves?

Q3:

A pipe that is closed at one end has a fundamental frequency of 48 Hz. The speed of sound in the air inside the pipe is 343 m/s. Find the length of the pipe. Give your answer to two significant figures.

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