COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 12, Problem 32QAP
To determine
The frequency of dogs panting on a hot summer day
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The area of a typical eardrum is about 5.0 x 10-5 m2. Calculate the sound power (the energy per second) incident on an eardrum at (a) the threshold of hearing and (b) the threshold of pain.
A creature can detect very small objects, such as an insect whose length is approximately equal to one wavelength of the sound the bat makes. If a
bat emits chirps at a frequency of 65 kHz, and if the speed of sound in air is 340 m/s, what is the Cmallest insect (in mm) the bat can detect?
Sound is detected when a sound wave causes the eardrum to vibrate (as shown). Typically, the diameter of the eardrum is about 8.4 mm in humans. When someone speaks to you in a normal tone of voice, the sound intensity at your ear is approximately 1.0 × 10-6 W/m2. How much energy is delivered to your eardrum each second?
Chapter 12 Solutions
COLLEGE PHYSICS
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- A sound wave traveling in air has a pressure amplitude of 0.5 Pa. What is the intensity of the wave?arrow_forwardTable 17.1 shows the speed of sound is typically an order of magnitude larger in solids than in gases. To what can this higher value be most directly attributed? (a) the difference in density between solids and gases (b) the difference in compressibility between solids and gases (c) the limited size of a solid object compared to a free gas (d) the impossibility of holding a gas under significant tensionarrow_forwardHow many times a minute does a boat bob up and down on ocean waves that have a wavelength of 40.0 m and a propagation speed of 5.00 m/s?arrow_forward
- Energy Delivered to the Ear. Sound is detected when a sound wave causes the tympanic membrane (the eardrum) to vibrate. Typically, the diameter of this membrane is about 8.4 mm in humans. (a) How much energy is delivered to the eardrum each second when someone whispers (20 dB) a secret in your ear? (b) To comprehend how sensitive the ear is to very small amounts of energy, calculate how fast a typical 2.0 mg mosquito would have to fly (in mm/s) to have this amount of kinetic energy.arrow_forwardthe human ear tends to be most sensitive to sound frequencies of 3 khz. the sound intensity at this frequency is usually measured as 3x10-13 w/m2. how much energy is transported by this type of sound wave to the eardrum (surface area of about 50mm2 ) in 200msarrow_forwardThe area of a typical eardrum is about 5.0 x 105 m2, (a) Calculate the sound power (the energy per second) incident on an eardrum at the threshold of hearing. (b) Calculate the sound power incident on an eardrum at the threshold of pain.arrow_forward
- A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 5.89 104 Hz, and if the speed of sound in air is 343 m/s, what is the smallest insect a bat can detect?mmarrow_forwardA bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 7.69 104 Hz, and if the speed of sound in air is 343 m/s, what is the smallest insect a bat can detect? ?mmarrow_forwardPage 22 of 24 Question 22 ( If the Mach number is 2.2 and the speed of an airplane measured by radar is 2115 km/h, what is the local speed of sound and the temperature of air? ➤11 *** Paragraph + v V I U A B EE V OF 90 30arrow_forward
- In the upper atmosphere at altitudes where commercial airlines travel, we find extremely cold tempera-tures. What is the speed of sound (in metric units) for a temperature of -47 ◦ C? Calculate to one decimal.arrow_forwardCicadas produce a buzzing sound that has a wavelength in air of 2.69 m. If the speed of sound in air is 346 m/s, what is the frequency of the sound produced by a cicada? What is its period?arrow_forward(a) Your heart beats with a frequency of1.45 Hz. How many beats occur in a minute? (b) If the frequencyof your heartbeat increases, will the number of beats in a minuteincrease, decrease, or stay the same? (c) How many beats occur ina minute if the frequency increases to 1.55 Hz?arrow_forward
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