1. Click the Rulers

Seat # ______Name ______Page 72

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What is Sound?

1. Click the rulers.

a. What do the rulers cause to vibrate? ______

b. We hear it as ______

c. The longer the ruler sticks out over the edge of the table, the ______the sound

2. Sound Waves

a. Sound is formed by ______

b. It is ______energy
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Click the wave

c. Air is pushed together at a higher pressure ______

d. And pulled apart at a lower pressure ______

e. These changes make ______waves

3. Pitch and Frequency
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a. How do the waves change? ______

b. Another name for Pitch is ______

c. Frequency is measured in ______

d. The Frequency of a whistle is ______
The Frequency of a bass drum is ______

4. Loudness and Decibels
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a. How do the waves change? ______

b. Loudness is measured in ______

c. What are the decibels of a Rock Concert? ______
What are the decibels of a normal conversation? ______

5. The Ear

a. Sound waves travel down the ______and cause the ______to vibrate.

b. ______in the Cochlea convert vibrations to electrical signals which are sent to the ______

Lesson 1: Sound Waves

1. Key Words:

a. Speed ______

b. Frequency ______

c. Wavelength ______

d. Longitudinal ______

e. Transverse ______

2. The wave is a ______that travels across the crowd

3. Do the people travel with the crowd? ______

4. Wave Types

a. What are the two main types of waves? ______& ______

5. Speed:

a. Waves travel at different ______

b. Ocean waves are slower than ______waves

c. How fast is sound? ______

d. How fast are radio waves? ______

6. Frequency:

a. Draw one complete wave:

b. How many waves passed in 5 seconds? ______

c. Frequency is ______/______

7. Wavelength:

a. What symbol do we use for wavelength? ______

b. What are the units? ______

c. The slower the ball; the ______the wavelength.

8. Longitudinal Wave (compression)

a. Longitudinal waves vibrate ______to the direction the wave travels.

b. What is an example of a longitudinal wave? ______

9. Transverse Wave

a. Transverse waves vibrate at ______to the direction the wave travels

b. What is an example of a transverse wave? ______

Lesson 2: Wave Equation

1. Wave Equation:

a. As frequency increases, wavelength ______

b. As speed increases, wavelength ______

c. What is the equation for speed? ______

d. What is the speed of a wave with frequency t 12022.5Hz and wavelength at 0.5m? ______

e. What is the speed of a wave with frequency t 3022.5Hz and wavelength at 0.5m? ______

f. What is the speed of a wave with frequency at 300Hz and a wavelength at 0.5m? ______

g. What is the speed of a wave with frequency at 500Hz and a wavelength at 0.8m? ______

2. Sound Transmission:

a. Sound waves travel quickly through a ______because particles are ______

b. Sound waves travel slowly through a ______because particles are ______

c. What is the speed of a wave with frequency at 300Hz and a wavelength at 1.5m? ______

d. What is the speed of a wave with frequency at 300Hz and a wavelength at 2.1m? ______

e. Diagram the equation as a triangle:______

f. What are the three equations: 1) ______2)______3)______

g. Sound has a velocity of 340m/s and a frequency of 2 kHz, what is the wavelength? ______

Lesson 3: Wave Behavior

1. Key Words:

a. Reflection is ______

b. Refraction is ______

c. Diffraction is ______

2. Reflection:

a. Two Laws of Reflection

i. The angle of ______equals the angle of ______

ii. The ______ray, the ______and the ______all lie in the same ______

3. Echoes:

a. What is an echo? ______

b. Fishing boats use echoes to detect ______and ______

c. What is this type of echo called? ______

d. What is the speed of sound in water? ______

e. How many seconds for the sound to reach the bottom? ______

f. What is the formula for speed? ______

g. How far away is the bottom? ______

h. What would happen if a school of fish swam under the boat? ______

4. Echoes in Use:

a. What is the distance? ______

b. What is the speed of sound? ______

c. What is the formula for speed? ______

d. What is the time delay before the echo is heard? ______

5. Refraction:

a. What happens to sound when it enters a denser material? ______

b. When waves change mediums, they change ______

c. What happens to the waves above in the shallower water? ______

d. They also change ______

6. Refraction:

a. When do trains sound louder? ______

b. During the day the sound is blocked by ______

c. Sound waves travel ______in cold air

d. The change in temperature causes the waves to ______over the buildings.

7. Diffraction:

a. You can hear someone around a corner before you ______them

b. Light has a ______wavelength so only ______objects can effect its ______

c. Sound waves can ______objects of ______to their wavelength.

8. Diffraction:

a. If the gap size equals wavelength, the diffraction ______and the wave ______