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# Sound Waves and Pressure

#### Sound Waves and Pressure: Investigation 1 - Vibrations and Sound

In Investigation One, you will learn about vibrations and how sounds are produced by exploring wavelengths, frequency, and standing waves. During this Investigation, you will:

1. Simulate standing waves as a meter stick is plucked at several distances extended from the table in order to illustrate the relationship between length and frequency of vibrations.

2. Analyze the frequencies and wavelengths of different standing waves in vibrating lengths of string to illustrate the inverse relationship between wavelength and frequency.

3. Identify a familiar song by plucking a meter stick at various distances extended from the table and analyzed the displacement of gas molecules as the sound vibrates.

#### Sound Waves and Pressure: Investigation 2 - Frequency and Speed of Sound

In Investigation Two, you will calculate the speed of sound in air using tuning forks of three different frequencies. During this Investigation, you will:

1. Use a 1000ml graduated cylinder filled with water, a PVC pipe, and tuning forks to explore frequency and length.

2. Calculate the speed of sound using the following formula:

Speed = wavelength x frequency

#### Sound Waves and Pressure: Investigation 3 - Sound Waves and Matter

In Investigation Three, you will model how different types of matter affect sound waves. During this Investigation, you will:

1. Model the speed of sound in three types of matter – air (gas), water (liquid), and iron (solid).

2. Calculate the speed of sound in solids, liquids, and gases.

#### Sound Waves and Pressure: Investigation 4 - Performance Assessment

This Performance Assessment is designed to allow students to solve a problem using the:

• concepts with which they have become familiar during the previous three Investigations, and
• procedures used during the previous three Investigations.