Phys 141 Sounds and Acoustics Exam 2, Spring 2018 Name I. Two loudspeakers emit

Question

Phys 141 Sounds and Acoustics Exam 2, Spring 2018 Name I. Two loudspeakers emit identical sounds in phase with each other. You will hear A louder sound since the sound from the two louwdspeakers will interfere with each other A quieter sound since the sound from the two loudspeakers will interfere with each two loudspeakers will interfere with each other destractive interference. hear other c) In some points of the room the sound will be louder, in others it will lower, since the sound from the d) In between the louadspeaker the sound will be louder but it will be lower on the sides due to e) There is a cancellation between the two sounds in most points in the room and they will be hard to b) Two waves having the same amplitude and frequency interfere as a crest meetsa be.. trough. The results will 2. a) constructive interference b) destructive interference c) resonance d) standing wave e) diffraction 3. The following are examples of diffraction The delay between the light and the sound of lightning a) b) Echo c) The sounds of two loudspeakers cancel each other if they are out of phase d) Sound travels further during a nighttime temperature inversion e) You can hear your friend in another room even though you cannot see her 4. A Doppler effect occurs when a source of sound moves a) toward you b) away from you both of these c) d) together with you e) none of above

Explanation / Answer

1.When two sound sources with the same phase interfere with each other Constructive interference occurs.

a->louder sound

2. Crest meets trough means amplitude becomes zero

b->destructive interference

3. e part

4. Any relative velocity between sound source effects frequency observer heard. That’s why C

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