Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 15, Problem 84P
(a)
To determine
The time the turner drops from the hole is to be evaluated.
(b)
To determine
The frequency no longer here turner is to be estimated.
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A microphone receiving a pure sound tone feeds an oscilloscope, producing a wave on its screen. If the sound intensity is originally 2.00×10-5 W/m2, but is turned up until the amplitude increases by 30.0%, what is the new intensity?
A speaker is producing spherically symmetric sounds with a total power of 88.5 W. If the speaker is located at the centre of a sphere with a radius of 2.20 m, what is the power received on a 1.70 m by 1.50 m area on the sphere? Give your answer in Watts to 2 decimal places.
The ability to hear a "pin drop" is the sign of sensitive hearing. Suppose a 0.50 g pin is dropped from a height of 27 cm, and that the pin emits sound for 1.4 s when it lands. Assuming all of the mechanical energy of the pin is converted to sound energy, and that the sound radiates uniformly in all directions.
Find the maximum distance from which a person can hear the pin drop.
(This is the ideal maximum distance, but atmospheric absorption and other factors will make the actual maximum distance considerably smaller.)
Chapter 15 Solutions
Physics for Scientists and Engineers
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- What frequency is received by a mouse just before being dispatched by a hawk flying at it at 25.0 m/s and emitting a screech of frequency 3500 Hz? Take the speed of sound to be 331 m/s.arrow_forwardA sound wave in air has a pressure amplitude equal to 4.00 103 Pa. Calculate the displacement amplitude of the wave at a frequency of 10.0 kHz.arrow_forwardThe speed of sound in dry air at 20 °C is 343 m/s and the lowestfrequency sound wave that the human ear can detect is approximately20 Hz. (a) What is the wavelength of such a soundwave?arrow_forward
- Your experiments on a particular insulator indicate that a 20 C the average speed of sound in the insulator is Vi = 7250 m/s Its bulk modulus is Bi = 450 GPa. Experimental results from your colleague show that a certain metal alloy has a density of rom = 7500 kg/m3 and a bulk modulus of Bm = 180 Gpa. The density of the insulator roi = 8561 kg/m3. The speed of sound in the metal alloy is Vm = 4898 m/s . A) Find the total amount of time t in seconds, It takes to travel through the structure in fig 1 the length of the structure is L = 1.0 m Alloy Insulator _______________________________________ L/2 L/2arrow_forwardA microphone receiving a pure sound tone feeds an oscilloscope, producing a wave on its screen. If the sound intensity is originally 2.00 × 10−5 W/m2 , but is turned up until the amplitude increases by 30.0% , what is the new intensity?arrow_forwardThe auditory canal of the outer ear acts as a closed end resonator which has a natural frequency of around 3500 Hz. This canal serves to amplify sounds with frequencies around this value, thus making us more sensitive to such frequencies. If the speed of waves inside the canal is 350 m/s, then what is the estimated length of the canal?arrow_forward
- A violin string of ?=31.8 cm in length and ?=0.64gm⁄ linear mass density is tuned to play an A4 note at 440.0 Hz. This means that the string is in its fundamental oscillation mode, i.e., it will be on that note without placing any fingers on it. From this information, Calculate the tension on the string that allows it to be kept in tune.arrow_forwardThe low-frequency speaker of a stereo set has a surface area of 0.06 m2 and produces 1 W of acoustical power. (b) If the speaker projects sound uniformly in all directions, at what distance from the speaker is the intensity 0.24 Wm2?arrow_forwardA tuning fork of unknown frequency makes 3.00 beats per second with a standard fork of frequency 384 Hz. The beat frequency decreases when a small piece of wax is put on a prong of the first fork.What is the frequency of this fork?arrow_forward
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