W7 Activity 1 - Intro. to Sound

W6 Activity 1

Intro. to Sound

By Nicholas Carrillo

Sound is a Pressure (Longitudinal) Wave

Disturbances in media (air, water, rock, metal, etc.) produce pressure waves (sound)

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Sound needs a medium to travel through, there's no sound in space because there is no medium for sound to travel through.​

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Speed of sound is based on temperature and density.

​Speed of Sound is Constant for a given temperature and density.

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Sound travels faster in denser media; speed of sound is ​~5x faster in water, and 20x faster in steel than in air.

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Multiple Choice

Why can sound not travel through space?

• There is no medium for sound to travel through

• There is sound in space, it is just too quiet to hear

• The pressure is too low for sound to travel through.

• The temperature is absolute zero in space.

Multiple Choice

Which medium does sound travel the fastest through?

• Air

• Water

• Steel

Multiple Select

Which options describe what a sound wave is?

(Select all that apply)

• Transverse

• Longitudinal (Compression)

• Pressure Wave

​Speed of Sound = λ * f

The speed of sound is constant for a given medium and temperature.

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Example: The speed of sound in air at 20°​C is ~340 m/s

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What is the wavelength of a 150 Hz sound wave at 20°C?

Speed of sound at 20°C is 340 m/s

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​Speed of Sound = Wavelength * Frequency

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340​ m/s = λ * 150Hz → λ = 340/150 → λ = 2.26 m

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Fill in the Blank

What is the wavelength, in meters, of a 34 Hz sound if the speed of sound is 340 m/s?

(Pull out your calculator)