SPH4AO SOUND TEST

 

                  NAME:

 

   1. Draw the resultant wave pattern produced by the two pulses shown.

 

 

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   2. If it is 10^oC outside and a jet aircraft is travelling at 1600 km/h, what is the mach number representing the speed of the plane?

 

 

 

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   3. What is the frequency and period of a sound wave of wavelength 0.50m at 20⁰C ?

 

  

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   4. Bob has two whistles as shown. If the speed of sound is 400m/s. Calculate the fundamental frequency each will produce. Draw in the wave pattern in each of the whistles as part of your solution.

 

  

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   5. Explain each of the following.

 

   a) beats

 

 

   b) ultrasound

 

  

 4  c) Doppler effect

 

 

   d) sonic boom

 

 

 

   6. If Bob sees a lightning bolt and 8.0 seconds later hears the thunder clap, how far away did the lightning strike if the temperature is 30⁰C?

    

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   7. The highest note on a piano is 18234 Hz, what is the wavelength of this sound if the temperature is 20⁰C?

 

  

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   8. What is the range of human hearing?

 

 

  

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   9. Why is it dangerous to work in an area where a sound of a particular frequency is heard over and over?

 

   

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   10. Jane's watch ticks with an intensity of 10dB, and Jane speaks with an intensity at 70 dB, how many times louder is Jane's voice?

  

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   11. An ambulance emitting a sound of frequency 450 Hz is approaching Bob at a speed of 100km/h. At what frequency will Bob perceive the sound as the ambulance approaches? as the ambulance pulls away ( passes)?

  

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   12. Answer the following questions with respect to the following diagram.

 

 

   a) Responsible for amplifying the sound.

 

   b) Area where vibrations are transformed into nerve pulses

 

   c) Two points where conduction deafness may occur.

 

   d) Two points where nerve deafness may occur.

 

   13. Identify the difference and define conduction deafness and nerve deafness.