Problem 4 (6 pts)
A tire explodes 200m from you. You measure the sound intensity at 4.00×10-2 W/m2 for 0.1s.
a) What is the total amount of energy transferred away from the explosion by sound?
b) What sound level (in decibels) do you hear?
Problem 4 (6 pts) A tire explodes 200m from you. You measure the sound intensity at...
You stand 5 meters away from two machines. One machine operates at a sound intensity level that is 50 dB at your location. The other machine operates at a sound intensity level of 70 dB at your location. What sound intensity level do you hear (measure in dB) when both machines are turned on?
You measure the sound intensity level as 70.5 dB at a location that is 4.31 m from a localized sound source. How far away from the source must you be for the intensity level to fall to 60.5 dB?
5. By how many decibels do you reduce the sound intensity level due to a source of sound if you double your distance from it? Assume that the waves expand spherically. dB 6. The sound in a classroom is 63000 times as intense as the minimum threshold of hearing. What is the intensity level of this sound in decibels? dB
You stand 30 m from a large speaker at a concert, and the intensity of the sound you hear from that speaker is 4×10−2 W/m2 . How much power is the speaker emitting? What is the intensity of the sound from the speaker at a distance of 60 m ? The pain threshold for humans is a sound intensity level of about 120dB. At what distance from this speaker would the sound be painful?
Sound Level Workset Name Sdverstone PH105 Spring 2018 Show all math stops and write wnis wi The sound level in decibels is given by Sound Level Exercise ?-10 where / is the intensity in W/mi and A 10 w I. If a sound level is 0 dB, does this mean tut there is no sound? Explain. 2. Does negative dB have meaning? Explain 3. The intensity of a sound from a motorcycle is twice that of a certain car in...
Two people are talking at a distance of 3 m from where you are and you measure the sound intensity as 9.3 × 10-7 W/m2. Another student is 9 m away from the talkers. What sound intensity, in 10-7 W/m2, does the other student measure? Assume that the sound spreads out uniformly and undergoes no significant reflections or absorption.
A jet plane at take-off can produce sound of intensity 9.30 W/m2 at 30.4 m away. But you prefer the tranquil sound of normal conversation, which is 1.0 μW/m2. Assume that the plane behaves like a point source of sound. What intensity from the jet does your friend experience if she lives twice as far from the runway as you do?
Question: Cicadas are loud flying insects that emerge en masse. Imagine you measure the sound level of a single male cicada to be 88.4 dB when your sound meter is 0.617 m from it. Only male cicadas make such loud noises. It is actually possible for cicadas to damage your hearing, you can learn more about how they make noise here. Part 1) What is the intensity of the sound produced by the cicada? I= W/m2 Part 2) Exactly 69...
Your friend is belching the alphabet. Where you are standing, a distance of 2 meters from your friend, the peak sound level of their belching is 68.2 dB. You would like to move far enough away from them that you won’t have to hear their belching. Assuming that the belch noises approximate spherical waves, how far should you stand from your friend in order for the peak intensity of the sound to be the threshold of hearing, 10^−12 W/m2?
The sound level at 1.0 m from a talking person is 60 dB. You are surrounded by five such people, all 1.0 m away from you and all talking equally loud at the same time. The threshold of hearing is 1.0x10-12 W/m2. What sound level are you being exposed to? You can neglect any absorption, reflection, or interference of the sound. Hint: log(A/B)= log (A)- log (B)