Sound waves may be best described as being
1.longitudinal waves.
2.transverse waves.
3.a combination of longitudinal and transverse waves.
4.analogous to water waves.
[Ques. 2] An airplane overhead exceeds the sound barrier and produces a conical wave front. If the air through which the plane flew had been significantly warmer and the plane were traveling at the same speed, how would the angle of the conical wave front been different?
1.The angle would have been greater.
2.The angle would have been less.
3.The angle would have been the same.
4.The change in the angle cannot be determined from the information given.
[Ques. 3] You are standing on a platform and a train approaches you, moving at a constant velocity. Its whistle is blowing continuously. The train does not stop at the platform, but it continues to move past the platform at a constant velocity. Which of the following statements are true about the frequency of the train's whistle that you hear?
1.The whistle's frequency that you hear increases continually as the train approaches the platform and then decreases continually after the train passes the platform.
2.The whistle's frequency that you hear seems to you to remain constant for the entire duration of the train's passage.
3.The whistle's frequency that you hear decreases continually as the train approaches the platform and then increases continually after the train passes the platform.
4.The whistle's frequency that you hear remains constant as the train approaches the platform and then decreases immediately after the train passes the platform, after which it remains constant at a lower pitch than it had originally.
[Ques. 4] Two sounds of the same intensity are added together. The intensity of the resulting sound is how many decibels greater than the intensity of one of the original sounds? The resulting sound
1.will have twice the decibel level as one of the original sounds.
2.will have the same decibel level as one of the original sounds.
3.will be two decibels higher than the original sound.
4.will be three decibels higher than the original sound.
[Ques. 5] Two sounds of the same intensity are added together. The intensity of the resulting sound is how much greater than the intensity of one of the original sounds?
1.It is the same intensity.
2.It is twice the intensity.
3.It is three times the intensity.
4.It is four times the intensity.
[Ques. 6] Someone is listening to a singer who is standing on a podium. The singer uses a set of speakers to broadcast her voice in all directions. The person listening cannot hear her very well, so he decides to walk closer to the podium. If his final distance to the podium is only half of his initial distance, what will be the final intensity of the singer's voice that the person hears compared to the initial intensity that he hears?
1.twice that of the first
2.half that of the first
3.four times that of the first
4.one fourth that of the first
[Ques. 7] Raising the temperature of air will
1.decrease the speed of sound in the air.
2.increase the speed of sound in the air.
3.not affect the speed of sound in the air.
4.sometimes increase and sometimes decrease the speed of sound in air.
[Ques. 8] For which of the following will the phenomenon of wave interference apply? (Choose the best answer.)
1.square-shaped pulses
2.sinusoidal pulses
3.triangular pulses
4.all of these
[Ques. 9] Waves of amplitudes 0.4 m and 0.3 m interfere while traveling in the same direction with the same speed. If the wavelengths are the same, what are the resulting largest and smallest amplitudes possible?
1.0.7 m and 0.5 m
2.0.7 m and 0.1 m
3.0.5 m and 0.35 m
4.0.5 m and 0.1 m
[Ques. 10] Three strings on a guitar are first stretched to the same tension. The first of the strings is heavy (thick), the third is light (thin), and the second is in between. Rank them according to the speed at which waves would propagate along them if they were plucked, with the fastest last.
1.(3) (2) (1)
2.(3) (1) (2)
3.(1) (2) (3)
4.The waves would propagate at the same speed through each.
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