2. Sound: What is it?
Sound is a disturbance that
travels through a medium
as a longitudinal wave.
3. Interactions of sound waves:
Reflection: Sound waves reflect
when they strike an object.
4. Interactions of sound waves:
Reflection: Sound waves reflect
when they strike an object.
You hear this as an echo.
5. Interactions of sound waves:
Reflection: Sound waves reflect
when they strike an object.
You hear this as an echo.
Diffraction: Sound waves “bend”
around corners or “squeeze”
through a door.
6. Interactions of sound waves:
Reflection: Sound waves reflect when they strike
an object.
You hear this as an echo.
Diffraction: Sound waves “bend” around corners
or “squeeze” through a door.
Interference: Sound waves may interact with
each other.
7. Speed of sound waves:
Depends on the elasticity, density,
and temperature of the medium
the sound is traveling through.
8. Speed of sound waves:
Depends on the elasticity, density,
and temperature of the medium
the sound is traveling through.
Elasticity: the ability of a material to
bounce back after it is disturbed.
9. Speed of sound waves:
Depends on the elasticity, density,
and temperature of the medium
the sound is traveling through.
Elasticity: the ability of a material to
bounce back after it is disturbed.
The more dense the medium the slower
sound travels through it.
10. Speed of sound waves:
Depends on the elasticity, density,
and temperature of the medium the
sound is traveling through.
Elasticity: the ability of a material to
bounce back after it is disturbed.
The more dense the medium the slower
sound travels through it.
The lower the temperature the slower
sound travels through a medium.
15. Properties of sound:
Loudness: Describes your
perception of the energy of the
sound.
Depends on distance from the source
and energy used to make the sound.
16. Properties of sound:
Loudness: Describes your
perception of the energy of the
sound.
Depends on distance from the source
and energy used to make the sound.
Measured in decibels (dB).
17. Properties of sound:
Loudness: Describes your perception
of the energy of the sound.
Depends on distance from the source
and energy used to make the sound.
Measured in decibels (dB).
Intensity: The amount of energy a
sound wave carries through an area
each second.
19. Pitch
A measure of how high or low a
sound is.
Pitch depends on the frequency of a
sound wave
20. Pitch
A measure of how high or low a
sound a is.
Pitch depends on the frequency of a
sound wave
21. Pitch
A measure of how high or low a
sound a is.
Pitch depends on the frequency of a
sound wave
- Low pitch
- Low frequency
- Longer wavelength
- High pitch
- High frequency
- Shorter wavelength
24. Sonar
- An instrument that uses reflected sound
waves to find underwater objects
- For example,
25. Sonar
- An instrument that uses reflected sound
waves to find underwater objects
- For example,
26. Sonar
- An instrument that uses reflected sound
waves to find underwater objects
- For example,
Animals use sonar or echo location to find their
prey; these sounds have such a high pitch or
frequency that the human ear cannot hear
27. Sonar
- An instrument that uses reflected sound
waves to find underwater objects
- For example,
Animals use sonar or echo location to find their
prey; these sounds have such a high pitch or
frequency that the human ear cannot hear
28. Sonar
- An instrument that uses reflected sound
waves to find underwater objects
- For example,
Humans use sonar
to locate or map
objects
Animals use sonar or echo location to find their
prey; these sounds have such a high pitch or
frequency that the human ear cannot hear
30. Doppler Effect:
Definition: The change in frequency
of a wave as its source moves in
relation to an observer.
Lower pitch
Higher pitch
31. Blue Man Group Challenge!
Blue Man Group
You’re HIRED!
So what am I supposed to do exactly?
32.
33. Can I use or make an instrument
that already exists?
No way! You could, if you really wanted
to…but wouldn’t you rather challenge
yourself to invent something never seen
before? C’mon, I know you can do it!
Besides, building a piano is really
complicated. And putting a piece of string
on top of a piano isn’t really
groundbreaking, either.
34. Let’s look at some examples!
Let’s look at some examples!
Awesome
Not Awesome
Shoe box with rubber bands attached
Oatmeal box with beads in it or paper on top
to create a drum
Tambourines made from paper plates
Bongos made from tubs and paper