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50-dB sound wave strikes an eardrum whose area is 5,0 * 10 m" The intensity of the reference level required to delermine lhe sound level is J0 x 10- W/m?_ 3.15...

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50-dB sound wave strikes an eardrum whose area is 5,0 * 10 m" The intensity of the reference level required to delermine lhe sound level is J0 x 10- W/m?_ 3.156 10"Incorrect; Try Again; 5 attempts remainingPart BAt this rate, how long would take the eardrum to receive total energy of 1.0 J? Express your answer using two significant figures:@18SubmitPrevious Answers Request AnswerIncorrect; Try Again; 3 attempts remainingAEd

50-dB sound wave strikes an eardrum whose area is 5,0 * 10 m" The intensity of the reference level required to delermine lhe sound level is J0 x 10- W/m?_ 3.156 10" Incorrect; Try Again; 5 attempts remaining Part B At this rate, how long would take the eardrum to receive total energy of 1.0 J? Express your answer using two significant figures: @ 18 Submit Previous Answers Request Answer Incorrect; Try Again; 3 attempts remaining AEd



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(II) $\mathrm{A} 50$ -dB sound wave strikes an eardrum whose area is $5.0 \times 10^{-5} \mathrm{m}^{2}$ . (a) How much energy is received by the eardrum per second? (b) At this rate, how long would it take your eardrum to receive a total energy of 1.0 $\mathrm{J}$ ?

Okay, So fifty five disability sound with is striking at our ear drum on the area of the Germans given, which is five point five point zero times ten four minus five minute squared. Now they given. So the sound level is given, which is beater, and then the area is given with his five times in five minutes five minutes cracked. So if we look at the question twelve point one, it gives us a relation between our sound level and the intensity. So I's the intensity at that sound level, and this is a special. So this is Thresh. Hold on. This is kind of a constant now. How much energy is received by the drunk per second is nothing, but. And as you absolved, per second is power of the wave, which is intensity times area. So whatever energy we have to calculate, that's nothing but calculating power. So power is intensity. Times superior. Now we can get our intensity from this equation, and the idea is given, so let's try to solve it. So from there, the question if we plug in all the numbers will have fifty five decibel, and that is equal to ten times. So we're basically using this equation. So it's going to be ten times log. Oh, intensity Now intensity is something that we're calculating and I not so well off I not is one times ten to the power minus twelve Give me a second, please. So my love I know is one times ten to the power minus twelve What? Barmy disquiet. So if we plug in that number over here So we have one times time for minus twelve What? Five meter squared And then if we trying to solve it So dividing fifty five by ten gives us five point five so five point five equals Log off Hi. Over ten to the power minus twelve. What for me? Described now from there we can write So this is match This is longest ten So we'LL have I over and to the poor minus twelve Why put me two squared is equal to and to the par five point five And if we take this guy over here, we'Ll have intensity equals ten to the power five point five times tend to the for five point five times one point zero tend to the bar minus twelve What? Disc? Laid. Right. And this gives us our value off. Three point mr three point one six two time. Stand to the bar minus seven. What about me, Slade? No. So now we know this value. So this is Norman. This is no one. So now we have to find out the power. So let's see. So power is gonna be Time's A what is three point one six toe time? Stand to the bar minus seven. What about a meter? Squared times the area which is five point zero times ten to the minus. Fi, neither is great, right? And between. If we solve for it, when you get something like one point five eight one times ten to the bar, minus eleven. What? And if we want to convert that to Jules for a second? Because what is Jules for? A second. It it's close toe. One point six times ten to the minus eleven. Do you use for a second? So Yeah. So that's helps that party. Now it says how much energy is deceived on DH for beating. At this rate, how long would it take your year drunk to receive that Orlan Asia one jewel. So in one second we receive this amount of energy, right? So if you wanna call it how much energy How much time we need will do something like this. So one, Jule. And then we have one second on. We have one point five eight one times Tend to the bar minus eleven. Jules. Now, if he so it's going to be a huge numbers. So we need to convert our seconds two years and to do so What we'LL do is we'LL put your on top and seconds on what bottom? So one year is three point one six times ten to the par seven seconds. So if we solve for it will get two zero zero one years R two times tend to the bar minus between Yeah, roughly. So that's how much time will it take for one jeweler off energy? That's how much time will it take for our year term to receive one to profanity? Thank you

In this question were given that some we've try sent their drum. So in practice A. We want to find out how much energy is absorbed by the ear drum each second. So, uh, the weeks that sound with eyes given to be you have a sound level or 15 50 decibels. So using, uh, better goes to 10 times long, based 10 I over. I know. Okay. So we can complete the, uh, intensity off some. Okay. Off the incoming sound would be 10 to the five times I know. She attended a five times 10 to the minus child gets 10 to the minus seven. What's firm? Union Square and the energy. It's all a second. Okay, so this is actually power. So this is equal to, uh, intensity times a area. So the intensity is found to be candid, a minus seven, the area off the year drum is given to be five times 10 to the minus five meter square. So if you can clear, we get five time tense five times 10 to the minus Troll. What? So this is the energy absorbed by that? Your drum per second. Okay, then you prats be, um He wants to find the time, uh, taken Or that year, drum your drum to itself. A total energy of one Jew K. So the time taken be, uh, one true divide by five kinds tend to the minus. Trial drew per second. So this is equal to two times 10 to the 11 seconds you can come with this. Two years and we'll get 6.3 times 10 to the tree. Yes. Okay. So to 50. Answer so, poppy.

Uh, once again welcome to a new problem. Was still dealing with sound waves. He assumed that's a Sinus oId Oh, off course. We do know that when you talk about sound waves, you have compressions rare factions. So this is this is how the sound waves move so there, Longitudinal, as opposed to Sinus idol. But for compasses off explaining sound with. Sometimes you might use the thesis sine waves so you might use assignments. It so happens that when they move on, the sound that you get from your ear is a based off vibrations. So if you listening right there and that's you hear inside of it, it is going to be an ear drum. And so the sound is traveling up until you, um, and these pressure on your ear drum So this is your ear drum on? It's very delicate. If it gets destroyed, then you're pretty much messed up in terms off your hearing, Um, levels. So in this sense, assumed that the intensity for this round way of his two point over times 10 to the negative three uh, gone once from meters squared, eso assumed That's you, um, you sound with his coming up on tool up until you hear. Of course, that's the pressure level. So when you hear something, it means that these these pressure on on inside of you here Oh, on these are These are your decibels. So you know the measurement measurement of sound. It's coming up until you, um and sometimes you might not feel comfortable. Okay, You might not feel comfortable. And that happens. That happens sometimes. S o. Let's assume that we have some sound. You know, let's assume you have sound, uh, that it's it's coming up until you hear and the units for measurement for this sound. This one here is what's once Amita squid off course. You're going to hear other units along the way. You'll hear people talk about Desi bells and other pressure units for sound. But for now, assume you're dealing with the intensity being two point all times 10 to the negative three. What's for me to sweat? And then your year drum. So this is your ear drum right here. So gonna assume that it's secular in nature and it has a diameter d off, uh, six point all millimeters damage. Is this distance right here? Um and of course, at this point was saying, If the sound is troubling up until your ear drum, you know what's the energy involved? We defined energy as Aziz work or force times distance, different ways of defining energy capacity. You know, it's the capacity to do work. So if your energy if your energy you're looking at your energy and you're listening to the sound for time period off. One minute you're asking yourself what's gonna be the energy involved in this process. So the you know the intensity we know the Oh, damn it. A, which is six millimeters. We're going to change that to, uh, meters. Of course, we can always get the radius from this. The radius is half the damage, so it's three millimeters. That's all radius. Uh, and if we change that too, two leaders one meter is Samos 1000 millimeters. So this becomes 3.0 times 10 to the negative three meters. That's your radius. The time period that this happens T is in minutes. So it's one minute, but one minute has 60 seconds. So we changed that two seconds. Um, and soul, these are the units were dealing with want to find What's the energy? What's the value of the energy that's get gets transferred to your ear? Drum your drum. Assuming it's secular, the area itself is a pyre square. That's the area of your ear drums. So this is the same spy times The radius were really change that too Meters three times 10 to the negative three meters and we square that. So this is 28.3 times 10 to the negative. Six meters squared. Um, that's the Now that's the area. So the energy that's gonna get into your ear e it calls to are the intensity times the area times the time are the disarmament. The intensity turns the area times the time that this happens. So this is 2.0 time. Stand to the negative three. What's the meters squared? And then multiply that by the area, which is 28.3 time. Stand to the negative six meters squared and then finally we have the time, which is 60 seconds. So this becomes the same month. E energy becomes a 3.39 times 10 to the They gave nine jewels three points 39 times stand to the negative angels. Or, you could say 3.39 Michael jewels. You want to call it that? Ah, 3.39 micro jewels. But, you know, we don't have to do my cordials. We could just leave it us in terms of jewels. We don't need Michael. Its energy units of energy is always comfortable in jewels, so that's what we're dealing with. So once again, you know, we had a problem where there was sound traveling, and it's longitudinal gets to you hear office is a lot of pressure going on what they want to find. What's the energy as the sound gets to your ear drops well, given the intensity of two point no times 10 to the negative three. I will also given the diameter six. That helps us get the radius. We change it two meters off the drum and then using the radius, we compute the area off the bedroom. And now that we have the area on the intensity with the time period off 60 seconds, we end up with 3.392 Instead of negative nine jewels, I hope you enjoy the problem. Feel free to send any questions or comments and have a wonderful day

In this question. We need to calculate the energy delivered to the your job each second at normal tone. Okay, so solution be using, uh, power. It goes to intensity times era. Okay, So how long is equal to the intensity, which is 10 to the minus six. What's familiar square, and then the area off the ear drum. Okay, so pi r Square. So the diameter is 8.4. Mm. So the region is 4.2. Mm. So come out to meet us. That's what we have. Then para square and calculate this. You get 25 times 10 to the minus 11. What? Okay. And then the energy delivered in one second. Okay, is just p times Delta T whether Delta t is one second. So the answer is 5.5 times 10 to the minus 11. What? Okay, so this is the answer for this question. That's all


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