Yes, when they"re out of phase. In simple terms, one wave has a crest while another has a trough, they cancel.

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Bees buzz b/c of the very fast rate of the fluttering of their wings. This produces disturbances in the air medium, which leads to the buzzing sound
Sound from source A has twice the frequency of sound from Source B. Compare the wavelengths of sound from the two sources.
In Olympic competition, a microphone detects the sound of the starter"s gun and sends it electrically to speakers at every runner"s starting block. Why?
Because the speed of sound is much slower than the speed of electricity, this reduces the split-second delay between firing the gun and the sound reaching the runner furthest away from the gun.
If a bell is ringing inside a bell jar, we can no longer hear it when the air is pumped out, but we can still see it. What differences in the properties of sound and light does this indicate?
If the frequency of a sound is doubled, what change will occur in its speed? What change happens to its wavelength?
The speed doesn"t change. Wavelength is speed/frequency, so if the frequency doubles and the speed stays the same, the wavelength is cut in half.

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Why can a tremor of the ground from a distant explosion be felt before the sound of the explosion can be heard?
Ultrasonic waves have many applications in technology and medicine. One advantage is that large intensities can be used without danger to the ear. What is another advantage of their short wavelength? (Why do microscopists use blue light rather than white light to see detail?)
- If an object is smaller than a wave"s wavelength, then the wave will simply defract around the object, instead of reflecting off of it (reflection allows you to see objects). This is why objects smaller than the wavelength of visible light do not have color and cannot be seen with light microscopes.- So, the small wavelength of ultrasonic waves means that they can reflect off of very small objects, allowing us to see them.
An echo is a reflected sound and thus, the intensity of an echo is less than that of the original sound
Suppose a piano tuner hears 3 beats per second when listening to the combined sound from a tuning fork and the piano wire being tuned. After slightly tightening the string, 5 beats per second are heard. Should the string be loosened or tightened?
What is the wavelength of a 340-hz tone is air? What is the wavelength of a 34,000-hz ultrasonic wave in air?
- wavelength = velocity/frequency.- speed of sound is about 340 m/s, so the wavelength of a 340-hz tone is 340/340 ~1 m- of an ultrasonic wave: 340/34000 ~0.001 m or 1 mm
An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 meters/second in seawater. How deep is the water directly below the vessel if the time delay of the echo to the ocean floor and back is 6 seconds?
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Engineering Electromagnetics (Irwin Electronics & Computer Enginering)8th EditionJohn Buck, William Hayt
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