science 14

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science 14
2015-05-11 18:01:05

apologia science modual 24
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  1. transverse wave
    a wave with a direction of propagation that is perpendicular of its direction of oscillation
  2. longitudinal wave
  3. supersonic speed
    any speed that is faster than the speed of sound in the substance of interest
  4. sonic boom
    the sound produced as a result of an object traveling at or above mach 1
  5. pitch
    an indication of how high or low a sound is which is primarily determined by the frequency of the sound wave
  6. in designing a car's horn the engineers test the sound of the horn and decide that its pitch is low. to adjust the horn should the engineers change the electronics so as to produce sound waves with longer or shorter wavelengths?
    produce shorter wavelengths
  7. a sound wave is traveling through the air with a temperature of 30c. what is the speed of the sound wave?
    349.5 m/sec
  8. if the sound wave in problem #3 has a wavelength of 0.5 meters what is its frequency?
  9. a sound wave has a speed of 345 m/sec and a wavelength of 500 meters. is this wave infrasonic , sonic ,or ultra sonic?
  10. a physicist takes an alarm clock into an airtight chamber. he puts the clock in with some air and can hear it form the other side. What happens if he vacuums all the air out? will he still hear it why or why not?
    he wont hear it because sound needs air to be heard
  11. are sound waves transverse waves or longitudinal waves?
    longitudinal waves
  12. you are watching lightning from a thunderstorm. you suddenly see a flash of lightning and 2.3 seconds later you hear thunder. how far away from you did the lightning strike? ( temp. at the time is 13C)
  13. sound waves are traveling through the air and suddenly run into a wall. as the sound waves travel through the wall so they go faster or slower or at the same speed they were traveling?
    faster because sound travels faster through solids then it does through gases(air is a gas)
  14. in the situation described above to the amplitude of the wave ? Is it smaller,larger,or the samw as the amplitude before the wabve hit the wall.
    gets smaller
  15. a jet aircraft is traveling at mach 2.5 through the air at 1C. what is the jet's speed in m/sec?
    830.25  m/sec
  16. a jet travels through the air at 464.1 m/sec. f the air has  a temperature of 0C at what mach number is the jet flying?
    Mach 1.4.
  17. why do jets travels at speeds of mach 1 or higher only in sparsly populated regions?
    so they don't harm anyone
  18. a guitar player is plucking on a string. if he takes his finger and pinches the string to the neck of the guitar so as to shorten the lenthg of the string will the pitch of the sound emitted increase, inrease, or stay the saem
  19. you hear two musical notes. they both have the same pitch but the first is louder than the second. if you compare the sound waves of each sound what aspects of the wavelength, frequenchy, speed, and amplitude would be the same? what aspects woukld be different?
    frequenchy and speed and wavelength would be the same.

    amplitude would change.
  20. the horn of your neighbors car is stuck so its constantly blaring. you watch your neighbor get in the car and drive away from you heading towards the nearest place for automobile service. compare the pitch of the horn before he starts to drive away to the pitch you hear as he is driving away.
    before he starts driving the pitch is high as he starts to drive away the pitch get lower
  21. you are riding a bike toward a stationary police car with a siren that is blaring away will the pitch of the siren sound lower, higher, or the same as it will sound when you actually stop your bike?
  22. you are standing near an interstate highway trying to talk on a pay phone. you have raised your voice because of the noise so the loudness of your voice is 80 decibels. the sound of traffic on the highway is 100 decibels. how manty times larger is the intensity of the traffic's sound waves compared to those of yours?
    100 times
  23. an amplifier can magnify the intensity of sound waves by factor of 1000. if the 30-decibel sound is fed into the amplifier how many decibels will come out?
     60  decibels