Mechanical Waves, Sound & the Electromagnetic Spectrum


Part II: Wave Speed (pg 323-324)



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Part II: Wave Speed (pg 323-324)

  1. The speed of an object equals the ________________________ traveled divide by the _______________________.




  1. Calculate the speed of a car that travels 70 miles in one hour. Show your work.


  1. What is the equation for the speed of a wave?



  1. What are the units for wavelength (check out Math Skills pg 324)? ____________________________

  2. What are the units for frequency (cycles per second)? ____________________________

  3. What happens to the wave speed if you increase the frequency?



  1. The musical note A above middle C has a frequency of 440 Hz. If the speed of sound is known to be 350 m/s, what is the wavelength of this note? Show your work!



  1. One of the largest organ pipes is in the auditorium organ in the convention hall in Atlantic City, New Jersey. The pipe is 38.6 ft long and produces a sound with a wavelength of about 10.6 m. If the speed of sound in air is 346 m/s, what is the frequency of this sound

Part III: The Behavior of Waves (pg 326-329)

  1. What is reflection? Give an example.


  1. What is refraction? Give an example. (pg 327 & 366)


  1. What is diffraction? Give an example.


  1. What is interference? Give an example.


  1. Label the types of interference in the pictures below



Part IV: Sound & Hearing (332-335)

  1. The image to the right shows sound waves traveling from the girl’s mouth to the guy’s ear. Are sound waves longitudinal or transverse waves?



  1. Through which media do waves travel the fastest? Why is this?


  1. Through which media do waves travel the slowest? Why is this?



  1. Sound intensity levels are measured in units called decibels. The decibel scale is based on powers of?



  1. A 0 decibel sound can just barely be heard. A 20 decibel sound has __________ times more energy per second than a 0 decibel sound.




  1. Pitch is the frequency of a sound. High-frequency sounds have a ____________________ pitch and low –frequency sounds have a _____________________ pitch.



  1. What important applications is ultrasound used for?



  1. _____ When an automobile moves towards a listener, the sound of its horn seems relatively

a. low pitched b. high pitched c. normal

  1. _____ When the automobile moves away from the listener, its horn seems

a. low pitched b. high pitched c. normal

  1. _____ The changed pitch of the Doppler effect is due to changes in

a. wave speed b. wave frequency

  1. True / False: A moving wave source does not affect the frequency of the wave encountered by the observer.



  1. True / False: A higher frequency results when a wave source moves towards an observer.



  1. Two fire trucks with sirens on speed towards and away from an observer as shown below.



  1. Which truck produces a higher than normal siren frequency?



  1. Which truck produces a lower than normal siren frequency?



  1. Label the parts of the ear




  1. Use the terms in the box to fill in the paragraph


Something vibrates to produce a sound. Sound travels through _______________ to the ear. When the vibrations reach the eardrum they are transferred to the small _______________ called the hammer, anvil and stirrup. The bones pass the vibrations to the _______________ . This contains sense cells which change the vibrations to _______________ signals called impulses. The auditory nerve takes the _______________ to the brain. We hear the sound when the message reaches the _______________ .



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