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How loud is 53 db

I have an almost 9 year old Kenmore elite dishwasher which will need to be replaced soon. It was considered to be "ultra-quiet", but I can't find a decibel rating for it anywhere. My kitchen is open to the family room, so quiet is a very important consideration. When the dishwasher is running, I can hear it, but I don't have to raise my voice or turn up the volume on the tv. The replacements I have been looking at are rated from 52 to 54 decibels.


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WATCH RELATED VIDEO: Air Conditioner Noise Test with Decibel Meter

Noise Level Chart


Determine the decibel rating of the following intensities of sound. The equation which relates the intensity of a sound wave to its decibel level is:. Using this equation, parts a - d can be computed in straightforward fashion. The intensity is 4 x 2. The intensity is 7 x 2. The intensity is 10 x 2. The intensity is x 2. A machine produces a sound with an intensity of 2. What would be the decibel rating if four of these machines occupy the same room? Four of these machines would be four times as intense as one machine - that would be an intensity of 1.

The decibel rating is. The sound in the United Center during a Chicago Bulls basketball game in was seven times as intense as it is today. If the decibel rating today is 89 dB, then what was the intensity rating in ? This problem involves finding the intensity level in the stadium today and then multiplying it by seven. The decibel level is substituted into the equation and then each side is divided by Now multiply by 7 since the intensity was seven times greater.

A sound has an intensity of 8. What is the intensity at a distance of This problem tests your understanding of the inverse square law: the intensity of a sound varies inversely with the square of the distance from the source of the sound. As the distance is doubled 4 m is two times 2 m , the intensity level is reduced by a factor of 4. The new intensity is 8. As the distance is tripled 6 m is three times 2 m , the intensity level is reduced by a factor of 9.

As the distance is quadrupled 8 m is four times 2 m , the intensity level is reduced by a factor of As the distance is increased by a factor of 12 24 m is 12 times 2 m , the intensity level is reduced by a factor of As the distance is increased by a factor of Ben Stupid is sitting 2.

The decibel rating of the sound heard there is dB. What would be the decibel rating at a location of This problem is similar to the last problem in that it tests your understanding of the inverse square law. There is however a slight twist. The decibel rating is given and since the decibel scale is logarithmic, we must first find the intensity level before we do the division. So the intensity level at 2.

Now the inverse square law is applied; the intensity of a sound varies inversely with the square of the distance from the source of the sound. The new intensity is 0. This converts to a decibel rating of dB. This converts to a decibel rating of dB As the distance is increased by a factor of 10 20 m is 10 times 2 m , the intensity level is reduced by a factor of This converts to a decibel rating of 90 dB.

Use the Doppler equation for a moving source to calculate the observed frequency for a Assume that the speed of sound in air is The Doppler equation for determining the observed frequency for a moving source is:. Shirley Yackin is holding the phone cord in her hand. It is stretched to a length of 2. If the tension in the phone cord is 2. The telephone cord acts as a guitar string. As such the speed of waves in the cord is given by the equation. The tension is given and the mu value can be calculated:.

Now substitute mu and F tens into the equation and solve for speed:. Referring to problem With what frequency must Shirley vibrate the cord up and down in order to produce the second harmonic within the cord? If Shirley is producing the second harmonic, then there will be one full wavelength in the length of the cord. Since the length of the cord is 2. With the wavelength and speed problem 59 known, the frequency can be calculated. Note that the unrounded number from problem 59 is used i this calculation.

If Shirley maintains this same frequency and wishes to produce the fourth harmonic, then she will have to alter the speed of the wave by changing the tension. Assuming the same mass density as in 59, and the same frequency as in 60, to what tension must the cord be pulled to produce the fourth harmonic? In this case, Shirley is changing the medium. So she is producing the fourth harmonic in a different medium different properties using the same frequency as in For the fourth harmonic, there are two full wavelengths inside the length of the cord see diagram at right ; so the length of the wave wavelength is one-half the length of the cord - 1.

With frequency and wavelength known, the speed can be computed:. Now with speed and mu known, the tension can be calculated from the equation:. First, perform algebra to manipulate the equation into a form with F tens by itself. This is done by squaring both sides of the equation and multiplying by mu. A guitar string has a mass of The string is pulled to a tension of N. Determine the speed at which vibrations move within the string.

This problem is very similar to question The speed of waves in the guitar string is given by the equation. The tension is given and the mu value can be calculated one will have to be careful of units :. Stan Dingwaives is playing this guitar. If Stan leaves the string "open" and uses its full length to produce the first harmonic, then what frequency will Stan be playing?

Answer: For the first harmonic, there is only one-half of a wave inside of the length of the string. So the length of the wave is two times longer than the length of the string see diagram at right. Thus, the wavelength is 2.

Now with speed and wavelength known, the frequency can be calculated. Referring to problem 62 and If Stan wishes to increase the frequency by a factor of 1. Use the same mass density and speed as in problem For the same speed same properties of the medium , frequency and wavelength are inversely related. Increasing the frequency by a factor of 1. So the new wavelength will be. Since the wavelength is twice the effective length of the string, the string must have an effective length of 0.

So, Stan must place his finger a distance of 0. Physics Tutorial. My Cart Subscription Selection. Intensity and the Decibel Scale. Answer: dB Four of these machines would be four times as intense as one machine - that would be an intensity of 1.

Answer: 5. Answers: See below. Answer: See answers below. Answer: 1. Useful Web Links. Answer: 0. Fundamental Frequency and Harmonics. Fundamental Frequency and Harmonics Guitar Strings.


Decibel Calculator

Determine the decibel rating of the following intensities of sound. The equation which relates the intensity of a sound wave to its decibel level is:. Using this equation, parts a - d can be computed in straightforward fashion. The intensity is 4 x 2. The intensity is 7 x 2. The intensity is 10 x 2.

A trumpeter plays at a sound level of 75 dB. Three equally loud trumpet players join in. What is the new sound level? 0. 1. 1.

4 Quietest Dehumidifiers With Below 53 dB Noise Levels


Generally speaking, noise levels are measured in decibels dBA , a metric commonly listed on generator specification sheets. Noise levels can vary significantly based on generator size and the manufacturer, ranging anywhere between mid and mid dBA. So, how do you know exactly how loud is too loud? Below we compare dBA levels to common sounds, giving you context to portable generator labels. You may also try contacting your city hall directly. Keep in mind that dBA is a variable metric based on distance from the source. Many generator manufacturers measure from approximately 23 feet 7 meters. Finally, compare the noise levels of generators with similar power capacities measured in either watts or amps for the most accurate assessment.

Comparative Examples of Noise Levels

how loud is 53 db

Sound is defined as any pressure variation that can be heard by the human ear. This means an average range of frequencies from 20Hz to 20kHz. In terms of sound pressure level, audible sounds range from the threshold of hearing at 0 dB to the threshold of pain which can be over dB. The dB decibel is the standard measurement unit in acoustics, yet it can be confusing to understand.

Noise Level Chart A noise level chart showing examples of sounds with dB levels ranging from 0 to decibels. Most noise levels are given in dBA, which are decibels adjusted to reflect the ear's response to different frequencies of sound.

Sound basics: measuring power in dB


Dehumidifiers can be quite noisy. Their humming can produce more than 65 dB noise levels ; not something you can ignore. To amend that, there is a special class of the quietest dehumidifiers. Pretty much every big dehumidifier manufacturer produces a whisper-quiet dehumidifier model. We gathered all the flagship quietest dehumidifiers from major, reliable brands. In short, the most silent dehumidifier should be so quiet you would have no problems sleeping with it in the room.

DECIBEL (LOUDNESS) COMPARISON CHART

The results showed noise levels outside the buildings varying between 53 and 76 dB during classes. Inside the classrooms, seven out of ten schools exceeded the standard permissible noise level of 40 dB established by Spanish regulations. Considering the limit recommended by the World Health Organization, WHO, 35 dB at school, nine out of ten schools fail to meet the recommended levels. A Chilean study found even worse conditions in Chile. Pedro Matamal, Head of the Otolaryngology Department, and engineers from Santiago University investigated noise levels in nine schools in Santiago de Chile.

Source of sound, Sound pressure level (dB) 60 dB. Washing machine, dish washer, dB. Normal conversation at 1 m, 40 - 60 dB.

Decibel Level Examples: How Loud are Sounds at Different dB Levels?

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Hearing loss can be a side effect of ototoxic medication and drugs. Find out which drugs can cause temporary or permanent hearing loss. It's not uncommon for rare diseases and genetic syndromes to cause hearing loss. Fortunately, hearing aids and other treatments often help.

Loudness is measured in decibels dB. As decibels rise, loudness quickly increases.

Oxygen torch dB. Steel mill, auto horn at 1 meter. Turbo-fan aircraft at takeoff power at ft dB. Riveting machine dB ; live rock music - dB. Jet take-off at meters , use of outboard motor, power lawn mower, motorcycle, farm tractor, jackhammer, garbage truck. Boeing or DC-8 aircraft at one nautical mile ft before landing dB ; jet flyover at feet dB ; Bell J-2A helicopter at ft dB.

Do you sleep, work, or study in the same room as your washing machine? Or do you have children who wake up easily? Choose an extra silent washing machine. This has a noise level of up to 71 decibels during the spin cycle.




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