Lesson: Sound Waves Physics • 9th Grade

In this lesson, we will learn how to describe sound wave propagation, define audible frequencies, and explain the applications of reflections of sound waves.

Lesson Plan

Students will be able to

identify a wavelength of a sound wave from an image of its compression and rarefaction regions,
apply the formula speed = frequency wavelength to sound waves,
use knowledge of the speeds of sound waves in different materials to show how reflected sound waves are used to measure distances between objects,
identify the frequency range of sound waves audible to humans.

Lesson Video

Lesson Worksheet

Q1:

Which of the following sound waves is an example of ultrasound?

Q2:

Which of the following sound waves is an example of infrasound?

Q3:

A string on a violin is pushed by a bow and the string vibrates at a frequency of 440 Hz. The sound waves produced by the vibrating string have a wavelength of 0.75 m. What is the speed of the sound waves?