W9 Review Activity - Sound Waves

W9 Review Activity

Sound Waves​

By Nicholas Carrillo

Open Ended

Give an example of a standing wave.

Fill in the Blank

String, wind, and brass instruments use ___ waves to create music.

Multiple Choice

Which describes a standing wave?

• A continuous wave that appears to stay still, with only its amplitude changing.

• A wave that reflects and interferes with itself

• A wave that constructively interferes with other incoming waves.

Multiple Choice

Which of the following best describes what different musical notes are?

• Standing waves at different frequencies.

• Traveling waves at different frequencies.

• Waves at different frequencies and wave lengths.

Multiple Choice

The points along a standing wave that do not oscillate (move back-and-forth) are called....

• nodes

• anti-nodes

• wavelength

• frequency

Multiple Choice

The points along a standing wave that do oscillate (move back-and-forth) at maximum amplitude are called...

• nodes

• anti-nodes

• wavelength

• frequency

Multiple Select

A wave with a fixed end will___the wave.

• invert

• reflect

• interfere with

• destroy

Multiple Select

What kind of standing waves an instrument makes depends on....

• If the ends of the string or pipe is fixed

• How fast the wave travels.

• The amplitude of the wave.

• If the ends of the string, or pipe, are fixed, or open.

Fill in the Blank

The simplest standing wave is known as the____.

Fill in the Blank

The more complicated standing waves are called...

Multiple Choice

The length of a string with both ends fixed is...

• Half the wavelength of the first harmonic

• Equal to the wavelength of the first harmonic

• Twice the wavelength of the first harmonic

Multiple Choice

If the fundamental frequency for a guitar string is 50Hz, what is the 8th harmonic frequency?

• 350 Hz

• 400 Hz

• 250 Hz

• 450 Hz

Multiple Choice

Pressing down on a guitar string, or open end of a flute...

• Changes the fundamental frequency (first harmonic) of the instrument

• Changes wave speed of the instrument

• Changes the amplitude of the standing waves in the instrument.

Multiple Choice

A pipe, or string, with a closed, or fixed, end can't have...

• ...even numbered harmonics

• ...odd numbered harmonics

• ...any harmonics.

Open Ended

The humidity in air affects the speed of sound. What kind of instruments do you think humidity will affect the modes? (String, or wind) In your own words, what do you think humidity changes about the sound instruments produce?