Summary

• Kepler's Third Law
• Oscillations
• Resonance

• Class Quiz    Timer
  
  

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  Chapter 14

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• Reading Quiz



• Waves
  • wavelength, frequency & speed
    oscillations & waves applet
    wave parameters applet
    Example #1
    
    Example #2
    
  • transverse & longitudinal
  • energy transport
  
• String waves
  • speed equation
  
  Example #3
  
  Example #4
  
  Example #5
  
  
  
• Sound waves
  • tuning fork
  • pressure waves applet
  • speed of sound
    Example #6
    
  • pressure & displacement
  
  
• Sound intensity
  • power/area
  • decibels
    Example #7
    
    Example #8
    
    Example #9
    
  
  
  
  
  
  
  
  

If a 1.00-m-long pendulum on planet Gnuton has a period of 3.26 s, what is the acceleration due to gravity on Gnuton?
A. 73.0 m/s²
B. 10.6 m/s²
C. 3.71 m/s²
D. 0.00238 m/s²
Answer















Walker4e
Reading quiz The three waves, A, B and C, (shown below) propagate on strings with equal tensions and equal mass per length. Rank the waves in order of increasing speed.
A. A < C < B
B. B < C < A
C. A < B < C
D. A = B = C
Answer















kw4
A sound wave travels through wood into aluminum, a stiffer medium than wood. The wave speed in aluminum will be ____ than the speed in wood.
A. higher
B. the same as
C. lower
Answer















kw4
If the frequency of a periodic wave is doubled while the velocity remains the same, what happens to the wavelength?
A. It is cut to one fourth.
B. It is cut in half.
C. It stays the same.
D. It doubles.
Answer















sj6 qq16.3
A sinusoidal wave is moving on a string. If you increase the frequency f of the wave, the transverse speed
A. increases
B. decreases
C. stays the same

Answer















sj6 qq16.3
A sinusoidal wave is moving on a string. If you increase the frequency f of the wave, the propagation speed
A. increases
B. decreases
C. stays the same
Answer















sj6 qq16.4
A sinusoidal wave is moving on a string. If you increase the frequency f of the wave, the wavelength
A. increases
B. decreases
C. stays the same
Answer















sj6 17.4 mod
How much time will it take sound from an airplane at 9000 m to reach the ground, assuming a constant temperature of 15°C?
A. 25.7 s
B. 26.5 s
C. 27.2 s
D. 38.1 s
Answer















sj6 17.25
Music at 80.0 dB is mixed with a crying baby at 75.0 dB. What is the combined sound level?
A. 5.0 dB
B. 77.5 dB
C. 81.2 dB
D. 155 dB
Answer















sb5 17.27
A 1-kHz source of sound emits uniformly in all directions. 3.00 meters away the sound level is 40.0 dB. What is the power output of the source?
A. 4.00 nW
B. 1.13 µW
C. 3.14 mW
D. 120 W
Answer















sb5 17.67
9 In how much time will a 30% efficient siren drain a 1.00 kJ battery if it generates 60.0 dB at a distance of 500 m?
A. 28.5 ms
B. 16.7 s
C. 60.0 s
D. 95.5 s
Answer















 



C. 3.71 m/s²





















 



D. A = B = C

The wave speed on a string is given by the square root of the tension divided by the mass per length. If the tensions and masses per length are all the same, then the wave speeds are the same.
























 



A. higher
A stiffer medium (larger spring constants) means faster oscillations and faster wave propagation.




















 



B. It is cut in half.





















 



A. increases





















 



C. stays the same
The wave speed depends only upon the properties of the medium.




















 



B. decreases





















 



B. 26.5 s





















 



C. 81.2 dB





















 



1.13 µW





















 



D. 95.5 s