Determining the sound level of a leaf blower

  • Thread starter Thread starter barryj
  • Start date Start date
  • Tags Tags
    distance Sound
AI Thread Summary
The sound level of a leaf blower rated at 75dB is typically measured at a distance of 50 feet, as indicated by a manufacturer's lobbyist. Sound intensity increases as one gets closer to the source, with a doubling of distance resulting in a decrease of approximately 6 dB. This means that at closer ranges, the perceived noise level can be significantly higher. The discussion highlights the importance of understanding measurement distances when evaluating noise levels. Accurate sound level assessments are crucial for compliance with noise regulations and for user comfort.
barryj
Messages
856
Reaction score
51
Homework Statement
How does one determine the dB of a leaf blower.
Relevant Equations
db = 10log(p1/p2)
I have a leaf blower that states the sound level is 75dB. My question is, at what distance is this measured. It seems that as you get closer to the source, the dB number will increase drastically. If I double the distance from the source, then the power should go down by a factor of four or 6 db. Is this correct?
 
Physics news on Phys.org
You are correct. Can you post a link for the product?
If not stated, I would take it as the expected distance from the device to the operator's ears.

Update: found this
https://www.nonoise.org/quietnet/cqs/leafblow.htm
"The average blower measures 70-75 dB at 50 feet according to a manufacturer's lobbyist"
So maybe 50 feet is standard.
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »
Thread 'Trying to understand the logic behind adding vectors with an angle between them'

Thread 'Trying to understand the logic behind adding vectors with an angle between them'

My initial calculation was to subtract V1 from V2 to show that from the perspective of the second aircraft the first one is -300km/h. So i checked with ChatGPT and it said I cant just subtract them because I have an angle between them. So I dont understand the reasoning of it. Like why should a velocity be dependent on an angle? I was thinking about how it would look like if the planes where parallel to each other, and then how it look like if one is turning away and I dont see it. Since...
View full post »
Thread 'Correct statement about a reservoir with an outlet pipe'

Thread 'Correct statement about a reservoir with an outlet pipe'

The answer to this question is statements (ii) and (iv) are correct. (i) This is FALSE because the speed of water in the tap is greater than speed at the water surface (ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not? (iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
View full post »

Similar threads

Measuring the Velocity of Sound in this Lab Exercise
Replies
19
Views
2K
Sound Power Level (SPL) of a loudspeaker
Replies
11
Views
2K
I Sound power, amplitude, frequency, and decibels
Replies
5
Views
2K
Attenuation Coefficient in an optical fibre
Replies
21
Views
2K
Calculating Sound Intensity and Pressure Variation at a Distance
Replies
4
Views
2K
Centrifugal blower ringing?
Replies
22
Views
3K
Calculating Power at source from Intensity at distance R
Replies
1
Views
4K
Sound Wave Interference and Finding the Path Differences with Diagrams
Replies
20
Views
5K
Change in sound intensity over distance
Replies
1
Views
4K
Problem on Doppler effect and sound level
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top