A sound wave in air at 20°C has a frequency of 320 Hz anda displacement amplitude of 5.00 * 10-3 mm. For this sound wavecalculate the (a) pressure amplitude (in Pa); (b) intensity (in W/m2);(c) sound intensity level (in decibels).
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A sound wave in air at 20°C has a frequency of 320 Hz and
a displacement amplitude of 5.00 * 10-3 mm. For this sound wave
calculate the (a) pressure amplitude (in Pa); (b) intensity (in W/m2);
(c) sound intensity level (in decibels).
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- The eardrum, which transmits sound vibrations to the sensory organs of the inner ear, lies at the end of the ear canal. For adults, the ear canal is about 2.6 cm in length. Frequency standing waves that can occur in the ear canal that are within the range of human hearing. Assume the speed of sound in the air of the ear canal to be 334 m/s. Write your answer with 3 sig fig. What is the lowest natural frequency for standing wave to be heard by humain?_____Hz What is the third lowest natural frequency for standing wave to be heard by humain?____Hz What is the second lowest natural frequency for standing wave to be heard by humain?_____HzThe intensity sound level in air is 65 dB. Calculate Pmax if the temperature is 20 C, the density of air is = 1.20 kg/m3 and the speed of sound is v = 344 m/s.The ultra-sound wave propagates in water with the density 1000 kg/m^3 and the sound velocity 1500 m/s. What is the amplitude of the pressure if the average intensity of the wave is 30000 W/m^2? (Give you answer in kilopascals)
- For a person with defective hearing ability, hearing aid is often required. Assume ahearing aid uniformly increases the intensity level of all audible frequencies of soundby 50 dB. The hearing aid picks up a sound at an intensity of 5.0 x 10-7 W/m2 at250 Hz. The threshold of pain in sound intensity level for a normal person at thisfrequency is about 122 dB. Will the threshold of pain be reached if a person withnormal hearing ability wears this hearing aid just for fun? Show how you reach yourconclusion.The higher frequency limit for human hearing is 22.8 kHz. If the air temperature is 33.3 °C, the corresponding wavelength (m) of the sound is:The area of a typical eardrum is about 5.0 × 10–5m2 . Calculate the sound power (the energy per second) incident on an eardrum at (a) the threshold of hearing and (b) the threshold of pain.
- Chapter 14 question 31For a person with normal hearing, the faintest sound that can be heard at a frequency of 400 Hz has a pressure amplitude of about 6.0 × 10-5 Pa. Use bulk modulus for air 1.42 × 105 Pa and v = 344 m/s at 20°C. Calculate the sound intensity level in decibels.A sound wave at 20° C has pressure amplitude of 2.00 Pa. The density of air is 1.2 Kg/m and the threshold for hearing intensity is 1012 w/m2. The speed of sound in air is 344 m/s. (a) Find the intensity of the sound wave. (b) Find the intensity in decibels.
- A pipe that is open at both ends has a fundamental frequency of 311 Hz when the speed of sound in air is 346 m/s. (a) What is the length of the pipe? m(b) What are the next two harmonics? 1st Harmonic = Hz 2nd Harmonic = HzRecent research has shown that the use of earbud-style headphones packaged with MP3 players can cause permanent hearing loss. (a) The intensity of the sound from the speakers of a certain MP3 player (without earbuds) is measured at 3.8 x 10-5 w/m2. Find the decibel level. (Round your answer to the nearest whole number.) dB (b) If earbuds are used with the MP3 player in part (a), the decibel level is 90 dB. Find the intensity. (Round your answer to three decimal places.) W/m2 (c) Find the ratio of the intensity of the sound from the MP3 player with earbuds to that of the sound without earbuds. (Round your answer to one decimal place.)The intensity of a sound wave, as it strikes a circular ear drum, is 0.65 W/m2. The amount of energy carried in this wave is 6 × 10-6 J, and the sound lasts for one second. Part (a) Calculate the radius of the ear drum, in meters. Part (b) If the sound wave travels at 326 m/s and has a wavelength of 1.1 m, calculate its frequency.