The sound intensity near a jet engine is 120 dB. Assuming an attenuation coefficient in air of x = 0.00553 m1, and neglecting geometrical spreading, what is the maximum distance at which someone with a normal hearing threshold can hear this engine? 5.00 km 9.42 km O 2.17 km 10.0 km
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- If a 16.0 cmcm cup is being filled with water, the fundamental frequency of sound when the cup is 55.0 %% full will be: Part A 2380 Hz 1190 Hz 1950 Hz 974 Hzhw 3 The human ear can detect a minimum intensity of Io = 10-12 W/m2, which has a sound intensity of 0 dB. β = 25 dB If the student hears a sound at 25 dB, what is the intensity of the sound?The following five problems should be calculated on paper, scanned or photographed, and submitted for credit. Convert the following sound pressures to sound pressure levels: p = 20 Pa p = 1 Pa p = 2 x 10-5 Pa Convert the following sound pressure levels to sound pressure: Lp = 80 dB Lp = 15 dB
- are Problem 3: A typical sound power of one mosquito is 5.154 x 10 W, You are standing 0.750 m away from a buzzing mosquito. a) From where you are standing, what decibel level will you hear from 1 mosquito? b) Your sound level meter tells you that the combined sound level of all of the mosquitos swarming you equal to 75.0 dB. How many mosquitos are making the sound? c) If 25.0% of the mosquitos fly far away from you, what is the new sound level of the remaining mosquitos?Your ear is capable of differentiating sounds that arrive at the ear just 1.00 ms apart. What is the minimum distance between two speakers that produce sounds that arrive at noticeably different times on a day when the speed of sound is 340 m/s?A family ice show is held at an enclosed arena. The skaters perform to music with level 75.0 dB. This level is too loud for your baby, who yells at 70.0 dB (a) What total sound intensity engulfs you? ___ W/m2(b) What is the combined sound level? ___ dB
- Problem 4. A point source emits sound waves uniformly in all directions. At distance 90.0 m from the source the sound intensity level is 15 dB. At what distance from the source is the sound intensity level 35 dB?What is the decibel level of a sound that has an intensity of 10.4 x 10-5 W/m2? Assume the standard dB level scale where the reference intensity is 1 x 10-12 W/m2A noise has an intensity of 2.4×10-8 W/m2. If the threshold of human hearing is I0 = 1.0×10-12 W/m2, calculate the sound intensity level in dB. Use two digits of precision for your answer.
- 12 gives the loudness of sound L (in dB) based on the intensity of sound I (in W/m²). The value I = 10 The formula L=10 log threshold for hearing for midfrequency sounds. Hearing impairment is often measured according to the minimal sound level (in dB) detected by an individual for sounds at various frequencies. For one frequency, the table depicts the level of hearing impairment. Category Mild Moderate Moderately severe Severe Profound Loudness (dB) 26≤L≤40 41≤L≤55 56≤L≤70 71 ≤L≤90 L>90 W/m is the minimal (a) If the minimum intensity heard by an individual is 9421.4 x 108 W/m², determine if the individual has a hearing impairment. Round to the nearest tenth. (b) If the minimum loudness of sound detected by an individual is 40 dB, determine the corresponding intensity of sound.A noisy factory machine produces a sound intensity of 1.00 x 10-5 W/m2 when measured 10 m from the machine. Assume that the sound spreads out uniformly into 3 dimensions for this set of questions. What is the sound power output of the machine? (Give your answer in mW.) What is the decibel level of the machine at 10 m? At what distance is the decibel level equal to 55 dB? (Give your answer in m.)The difference in two sound levels, β1 and β2, in decibels (dB), is given by the logarithmic equationβ2 − β1 = 10 log ( I2/,I1) where I2/I1 is the ratio of their intensities. a) The sound level of a jet at take off is 140 dB, while the level of a normal conversation is 50 dB. What is the ratio of the intensities of the sound level of the jet versus the level of normal conversation? b) What is the loudness of a jackhammer (in use) if it is known that this sound has anintensity 10 times that of sound due to heavy city traffic (90 dB)?