Exam 16: Sound and Hearing

An air column,open at one end and closed at the other,is being designed so that its second lowest resonant frequency is 440 Hz.What should be the length of the column if the speed of sound in air is 340 m/s?

An organ pipe open at both ends has two successive harmonics with frequencies of and .What is the length of the pipe? The speed of sound is in air.

A pipe that is 20.0 m long and 10.0 cm in diameter contains olive oil.The density of the olive oil is 890 kg/m³ and the bulk modulus is 1.3 × 10⁹ Pa.A 3.4-Hz longitudinal wave is transmitted in the oil.How many milliseconds does it take for the wave to travel the length of the pipe in the oil?

Two strings of identical material and radius are stretched with the same tension with their ends fixed,but one string is 8.0 mm longer than the other.Waves on these strings propagate at 420 m/s.The fundamental frequency of the longer string is 528 Hz.What is the beat frequency when each string is vibrating at its fundamental frequency?

A jet aircraft,in level flight at constant speed,is observed directly overhead.A sonic boom is heard later,at which time the line of sight to the aircraft forms a 51° angle with respect to the horizontal.The speed of sound is .The altitude of the aircraft is closest to

The density of aluminum is 2.7 × 10³ kg/m³.The speed of longitudinal waves in an aluminum rod is measured to be .What is the value of Young's modulus for this aluminum?

A person is hearing two sound waves simultaneously.One has a period of 1.50 ms and the other one a period of 1.54 ms.What is the period of the beat due to these two waves?

The sound level at 1.0 m from a certain talking person talking is 60 dB.You are surrounded by five such people,all 1.0 m from you and all talking equally loud at the same time.The threshold of hearing is .What sound level are you being exposed to? You can neglect any absorption,reflection,or interference of the sound.The threshold of hearing is 1.0 × 10^-12 W/m².

The speed of sound in the air inside a 0.640-m long gas column is 340 m/s.What is the fundamental resonant frequency of this air column if it is (a)open at one end and closed at the other end? (b)open at both ends?

Two identical loudspeakers that are 5.00 m apart and face toward each other are driven in phase by the same oscillator at a frequency of 875 Hz.The speed of sound in the room is .If you start out standing midway between the speakers,find the shortest distance you can walk toward either speaker in order to hear a minimum of sound.

A howler monkey is the loudest land animal and,under some circumstances,can be heard up to a distance of 5.0 km.Assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is .The acoustic power emitted by the howler is closest to

A violin with string length 32 cm and string density resonates with the first overtone from a 2.0-m long organ pipe with one end closed and the other end open.What is the tension in the string?

A pipe is 0.90 m long and is open at one end but closed at the other end.If it resonates with a tone whose wavelength is 0.72 m,what is the wavelength of the next higher overtone in this pipe?

What characteristic of sound determines the "pitch" of a musical note?

A plane flies toward a stationary siren at 1/4 the speed of sound.Then the plane stands still on the ground and the siren is driven toward it at 1/4 the speed of sound.In both cases,a person sitting in the plane will hear the same frequency of sound from the siren.

Two harmonic sound waves reach an observer simultaneously.The observer hears the sound intensity rise and fall with a time of 0.200 s between the maximum intensity and the succeeding minimum intensity.What is the difference in frequency of the two sound waves?

A carousel that is 5.00 m in radius has a pair of 600-Hz sirens mounted on posts at opposite ends of a diameter.The carousel rotates with an angular velocity of 0.800 rad/s.A stationary listener is located at a distance from the carousel.The speed of sound is 350 m/s.The longest wavelength reaching the listener from the sirens is closest to

Two pure tones are sounded together and a particular beat frequency is heard.What happens to the beat frequency if the frequency of one of the tones is increased?

In a resonating pipe that is open at one end and closed at the other end,there

Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 5.00 m.A person is standing 12.0 m away from the wall,equidistant from the loudspeakers.When the person moves 1.00 m parallel to the wall,she experiences destructive interference for the first time.What is the frequency of the sound? The speed of sound in air is 343 m/s.