Harmonic waves are sent along a rope at a speed of 20m/s. What is the frequency of the wave if successive wave crests are 2.5 m apart?
Two speakers are driven by the same oscillator whose frequency is f. They are located a distance d from each other on a vertical pole. A man walks straight toward the lower speaker in a direction perpendicular to the pole, as shown in Figure P14.10. (Note the answers must be in all variables) (a) How many times will he hea
1. The intensity of sound 20 meters from a race car is 0.0100 W/m^2. (A) What is the sound intensity level in dB? (B) What would the intensity (in W/m^2) be at a distance 80 m from the car? Find the corresponding intensity level in dB. 2. Suppose a violin player touches the "A" string 1/3 of the distance from the end, which
(See attached file for full problem description) --- The Beat Heard by a Bat A bat flies toward a wall, emitting a steady sound with a frequency of 25.0 . This bat hears its own sound plus the sound reflected by the wall. Part A How fast should the bat fly, , to hear a beat frequency of 220 ? Take the speed of soun
(See attached file for full problem description with proper symbols and diagram) --- Harmonics of a Piano Wire A piano tuner stretches a steel piano wire with a tension of 800 N. The steel wire has a length of 0.400 m and a mass of 3.00 g. Part A: What is the frequency f1 of the string's fundamental mode of vibration?
(See attached file for full problem description and figures) --- 21.8 The figure shows a standing wave oscillating at 100 Hz on a string. Part A : What is the wave speed? 21.5 A 40-cm-long tube has a 40-cm-long insert that can be pulled in and out. A vibrating tuning fork is held next to the tube. As the ins
A sound wave has a speed of 350 ms and a frequency of 20,000 hz. The wavelength of the sound wave is what?
Taking right to be positive, if a speaker is moving at a velocity of -22 m/s while emitting a sound of frequency 1385 Hz, what frequency will you hear? If the situation is reversed in the above problem and you are the one that is moving, what would be the answer? (Remember right is positive.) See attached file for full pr
A fishing boat is drifting just above a school of tuna on a foggy day. Without warning, an engine backfire occurs on another boat 1.40 km away. How much time elapses between the instant when the backfire is heard by the fish?
A sailor strikes the side of his ship just below the surface of the sea. He hears the echo of the wave reflected from the ocean floor directly 3.85 s later. How deep is the ocean at this point?
When a fast moving, pitched sound such as a siren travels towards and past me its perceived pitch changes. Can you please explain what this is commonly known as and why this phenomenon occurs?
A hollow log, open at one end, is struck with a stout stick. The hollow cavity of the log is 6 meters long, and the pressure waves that constitute sound travel at 342m/s. What are the frequencies of the resulting first four harmonics?
A sound source is moving toward a microphone at 25 m/s, emitting sound at a constant frequency of 740 Hz (i.e. 740 pulses per second). If the source starts out 5 meters from the microphone then: -how many pulses are emitted as the source approaches the microphone? -how long is it between the instant the microphone receives
A steel guitar string has a length of 74 cm and thickness of 0.37 mm. It is under 35N tension. Calculate the wave speed in the string. The density of steel rho=7.84 x 10^3 kg/m^3.
A train is approaching a station and blows its horn with a frequency of 200hz. If the train has a speed of 25 m/s and the speed of sound is 350 m/s, what is the frequency of sound heard by the people standing on the platform a. 190hz b. 186hz c. 210 hz d. 200hz
A cord is 20cm long, four complete waves fit along its length when vibrated 30 times per second for the waves on the cord. What is the wavelength? What is the frequency? What is the speed?
A loudspeaker is placed between two observers who are 120m apart along the line connecting them. If one observer records a sound level of 60dB and the other records a sound level of 90dB, how far is the speaker from each observer?
A piano tuner hears one beat every 2.0s when trying to adjust two strings, one of which is sounding 440Hz. how far off in frequency is the other string?
(a) calculate the wavelengths in air at 20°C for sounds in the maximum range of human hearing, 20 Hz to 20,000 Hz. (b) what is the wavelength of a 10-MHz ultrasonic wave?
A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 1.5 s after shouting. Estimate the length of the lake.
Question: A rope of mass 0.65 kg is stretched between two supports that are 30 m apart. If the tension in the rope is 120 N, how long will it take a pulse to travel from one support to the other? I am having trouble understanding this above question. Can you please explain this in a simple, non-confusing way.
If the handle of a tuning fork is held solidly against a table, the sound from the tuning fork becomes louder. Why? How will this affect the length of time the fork keeps vibrating? Please explain. This is a CONCEPTUAL question.
The force stretching the D string on a guitar is 150N. The string's linear mass density is 0.005 kg/m. What is the speed of the waves on the string?
At an open-air concert a person sits at a location that is 7m and 9.10m, respectively, from speakers at each side of the stage. A musician plays a single 494 Hz tone, explain what the listener hears. Assume the speed of sound is to be 346ms-1.
A 1500-Hz sound and a 8500-Hz sound each emerge from a loudspeaker through a circular opening whose diameter is 0.30 m. Assuming that the speed of sound in air is 343 m/s, find the diffraction angle θ for each sound
The range of human hearing is roughly from twenty Hz 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 organ?
When a guitar string is sounded along with a 440 Hz tuning fork, a beat frequency of 5Hz is heard. When the same string is sounded along with a 436 Hz tuning fork, the beat frequency is 9 Hz. What is the frequency of the string?
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?
(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?