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# Sound & Hearing

### distance to object that reflects the pulse back to the submarine

A sonar unit on a submarine sends out a pulse of sound into seawater. The pulse returns 1.30 seconds later. What is the distance to the object that reflects the pulse back to the submarine?

### Physics: Diffraction angle of sound emerging from loudspeaker; wavelength of sound

(a) When sound emerges from a loudspeaker, is the diffraction angle determined by the wavelength, the diameter of the speaker, or a combination of these two factors? (b) How is the wavelength of a sound related to its frequency ? Explain your answers. The following two lists give diameters and sound frequencies for three

### Sound waves. what are the lengths of the longest and shortest pipes (open at both ends and producing sound at their fundamental frequencies) that you expect to find in a pipe?

The range of human hearing is roughly from twenty hertz to twenty kilohertz. Based on these limits and a value of 343 m/s for the speed of sound, what are the lengths of the longest and shortest pipes (open at both ends and producing sound at their fundamental frequencies) that you expect to find in a pipe?

### Calculating the frequency of a string.

When a guitar string is sounded along with a 440Hz tuning fork, a frequency of 5 Hz is heard. When the same string is sounded along with 436 Hz tuning fork, the beat frequency is 9 Hz. What is the frequency of the string?

### Determining the type of interference from the given situation.

A person stands between two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is 1.65 m from one speaker and 4.95 m from the other. What type of interference does the person sense? a: constructive b: destructive c

### A droppler question is imparted.

An untethered(free) weather balloon travelling with the wind (at wind speed) emits a 1 khz sound wave. The wind is blowing with respect to the land due east at .25 times the speed of sound in air. If the free balloon is moving away (due east)from a tower at same height, what is the frequency of the sound detected at the tower?