2. Sound Waves You Have to Hear This!!!!

3. Producing a Sound Wave Like all waves, sound waves are produced by a ________.  A tuning fork ________ to produce a sound.  A guitar string ________ to produce a sound.  Your vocal cords ________ to produce a sound.  A tree that falls in the woods causes a _______ and produces a sound– ______________________________!!!!!!!

4. Properties of Sound Waves Sound Waves are ___________ Waves. As the fork moves forward and back it alternately ___________ and then ____________ the air (or whatever medium it is traveling through). From above the source it looks more like this:

5. Properties of Sound Waves Sound Waves are ________________ This means they _____ have a medium (matter) to travel. This means sound waves _______ travel through empty space ( a vacuum).

6. Properties of Sound Waves The _________ of a Sound Wave is related to the density of the compressed part of the wave. The __________ the compression the higher the amplitude. The Amplitude for a sound wave is related to its ________. The larger the amplitude the ______ the sound.

7. Properties of Sound Waves The __________ of a sound wave is related to its _____. The higher the _____ the higher the __________. Pitch is __________: Two people can disagree about whether a sound has a high pitch or a low pitch. Frequency is _________: 262.5 Hz < 430 Hz

8. Properties of Sound Waves All sound travels at the ____ speed in the ____ medium. This speed is called the speed of sound. The speed of sound in air is : ___ m/s (___ mph) The speed of sound in water: ____ m/s (____ mph) The speed of sound in concrete: ____ m/s (____ mph) The speed of sound in steel: ____ m/s (_____ mph)

9. Properties of Sound Waves Sound & the Wave Equation High frequency sound has a _____ wavelength. Low frequency sound has a ____ wavelength.

10. Properties of Sound Waves What is the wavelength of a sound wave that has a frequency of 440 Hz (A)? Assume the speed of sound is 343-m/s. Know: Find: Equation: Solve: v λ f

11. The Doppler Effect Whenever a source of sound is moving, the pitch you hear depends on whether the sound source is moving towards you or away from you.