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## Waves and Sound

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### Title: Waves and Sound Author: officeuser Last modified by: officeuser Created Date: 6/14/2012 2:31:56 PM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Waves and Sound

1
Waves and Sound
• SPH3U Exam Review

2
Sound Speed
• 1. The speed of sound in water is ____________
the speed of sound in air.
• A. faster than
• B. slower than
• C. the same as
• D. Sound does not travel through water.

3
Sound Speed
• 1. The speed of sound in water is ____________
the speed of sound in air.
• A. faster than
• B. slower than
• C. the same as
• D. Sound does not travel through water.

4
Rarefactions
• 2. In a sound wave, rarefactions are areas of
• A. high amplitude
• B. low amplitude
• C. high pressure
• D. low pressure

5
Rarefactions
• 2. In a sound wave, rarefactions are areas of
• A. high amplitude
• B. low amplitude
• C. high pressure
• D. low pressure

6
Frequency
• 3. If the frequency of a sound wave is increased,
the sound will have
• A. a faster speed
• B. a higher pitch
• C. more energy
• D. all of the above

7
Frequency
• 3. If the frequency of a sound wave is increased,
the sound will have
• A. a faster speed
• B. a higher pitch
• C. more energy
• D. all of the above

8
The decibel scale
• 4. 1 m away from a sound, the intensity is 60 dB.
What is the intensity 10 m away?
• A. 6 dB
• B. 30 dB
• C. 40 dB
• D. 50 dB

9
The decibel scale
• 4. 1 m away from a sound, the intensity is 60 dB.
What is the intensity 10 m away?
• A. 6 dB
• B. 30 dB
• C. 40 dB
• D. 50 dB

10
Doppler shift
• 5. If you move toward a sound with a frequency of
200 Hz, the apparent frequency of the sound will
be __________ 200 Hz.
• A. less than
• B. greater than
• C. equal to
• D. It cannot be determined.

11
Doppler shift
• 5. If you move toward a sound with a frequency of
200 Hz, the apparent frequency of the sound will
be __________ 200 Hz.
• A. less than
• B. greater than
• C. equal to
• D. It cannot be determined.

12
Two sources
• 6. Two loudspeakers are placed about 70 cm apart.
Each speaker is emitting sound with the same
frequency. As you walk slowly past the
loudspeakers, you hear alternating soft and loud
sounds. This effect is best explained by
• A. diffraction
• B. interference
• C. reflection
• D. refraction

13
Two sources
• 6. Two loudspeakers are placed about 70 cm apart.
Each speaker is emitting sound with the same
frequency. As you walk slowly past the
loudspeakers, you hear alternating soft and loud
sounds. This effect is best explained by
• A. diffraction
• B. interference
• C. reflection
• D. refraction

14
Beats
• 7. A tuning fork has a frequency of 256 Hz. When
the tuning fork and a piano key are sounded
together, beats of frequency 2 Hz are heard. What
is the frequency of the sound produced by the
piano?
• A. 254 Hz
• B. 258 Hz
• C. 512 Hz
• D. either A or B

15
Beats
• 7. A tuning fork has a frequency of 256 Hz. When
the tuning fork and a piano key are sounded
together, beats of frequency 2 Hz are heard. What
is the frequency of the sound produced by the
piano?
• A. 254 Hz
• B. 258 Hz
• C. 512 Hz
• D. either A or B

16
Resonance
• 8. Resonance occurs when the frequency of the
forcing vibration is _____________ the natural
frequency of the object.
• A. the same as
• B. greater than
• C. less than
• D. both A and B

17
Resonance
• 8. Resonance occurs when the frequency of the
forcing vibration is _____________ the natural
frequency of the object.
• A. the same as
• B. greater than
• C. less than
• D. both A and B

18
Air columns
• 9. An open air column is made to resonate in air
at 25oC and air at 0oC. The pitch of the sound
produced is
• A. higher in air at 25oC
• B. higher in air at 0oC
• C. the same in both cases
• D. It cannot be determined.

19
Air columns
• 9. An open air column is made to resonate in air
at 25oC and air at 0oC. The pitch of the sound
produced is
• A. higher in air at 25oC
• B. higher in air at 0oC
• C. the same in both cases
• D. It cannot be determined.

20
Closed air columns
• 10. An air column open at one end only is
increased in length. The air column first
resonates with a given tuning fork when the
length of the air column is 20 cm. The next
length that will resonate with the same tuning
fork is
• A. 30 cm
• B. 40 cm
• C. 60 cm
• D. 80 cm

21
Closed air columns
• 10. An air column open at one end only is
increased in length. The air column first
resonates with a given tuning fork when the
length of the air column is 20 cm. The next
length that will resonate with the same tuning
fork is
• A. 30 cm
• B. 40 cm
• C. 60 cm
• D. 80 cm

22
Sound frequency
• 1. What is ultrasound? What is infrasound?

23
Sound frequency
• 1. What is ultrasound? What is infrasound?
• Ultrasound sound of frequencies above the range
of human hearing (gt 20 kHz)
• Infrasound sound of frequencies below the range
of human hearing (lt 20 Hz)

24
Harmonics
• 2. Sketch the standing wave patterns of the first
and second harmonics of an open air column. Label
nodes and antinodes.

25
Harmonics
• 2. Sketch the standing wave patterns of the first
and second harmonics of an open air column. Label
nodes and antinodes.

Node
Node
Node
Antinode
Antinode
Antinode
Antinode
Antinode
26
Problem Solving 1
• 1. A lightning flash is seen 8.0 s before the
rumble of the thunder is heard. Find the distance
to the lightning flash if the temperature is
21oC.

27
Problem Solving 1
• 1. A lightning flash is seen 8.0 s before the
rumble of the thunder is heard. Find the distance
to the lightning flash if the temperature is
21oC.

28
Problem Solving 1
• 1. A lightning flash is seen 8.0 s before the
rumble of the thunder is heard. Find the distance
to the lightning flash if the temperature is
21oC.

29
Problem Solving 2
• 2. A string resonates with a fundamental
frequency of 1024 Hz. The speed of sound in the
string is 1800 m/s. (a) Sketch the standing wave
pattern and (b) calculate the length of the
string.

30
Problem Solving 2
• 2. A string resonates with a fundamental
frequency of 1024 Hz. The speed of sound in the
string is 1800 m/s. (a) Sketch the standing wave
pattern and (b) calculate the length of the
string.

31
Problem Solving 2
• 2. A string resonates with a fundamental
frequency of 1024 Hz. The speed of sound in the
string is 1800 m/s. (a) Sketch the standing wave
pattern and (b) calculate the length of the
string.