How Is Sound Intensity Calculated at Different Distances from a Trumpet?

In summary, the conversation discusses the calculation of sound intensity level for a trumpet emitting sound at a rate of 0.800 W through a 12.7 cm diameter opening. The question arises whether the area used in the calculation should be a circle or a sphere for different scenarios. The answer confirms that a circle should be used for the first scenario and a sphere for the second.
  • #1
dimpledur
194
0

Homework Statement



When playing fortissimo (very loudly), a trumpet emits sound energy
at a rate of 0.800 W out of a bell (opening) of diameter 12.7 cm. (a) What is the sound
intensity level right in front of the trumpet? (b) If the trumpet radiates sound waves
uniformly in all directions, what is the sound intensity level at a distance of 10.0 m?



The Attempt at a Solution



My only question for the following question has to do with area. I know that I = P / A.. However, for a), since it is at the very end of the trumpet, would the area be pi*r^2, rather than the area for a sphere?

I know that for b) it is the area of a sphere, but I was thinking for a) it would be a circle. Apparently this question is supposed to be hard, so that's why I was thinking that.

Thanks!
 
Physics news on Phys.org
  • #2
You are quite right on all counts.
 
  • #3
Thank you. I was a bit unsure about the area for a), but it's nice to have some clarification that it is a circle.
 

Related to How Is Sound Intensity Calculated at Different Distances from a Trumpet?

What is sound intensity?

Sound intensity is a measure of the amount of sound energy that passes through a specific area in a given amount of time.

How is sound intensity measured?

Sound intensity is typically measured in decibels (dB) using a sound level meter. This device measures the sound pressure level in a specific location and converts it to a decibel reading.

What factors affect the sound intensity of a trumpet?

The sound intensity of a trumpet is affected by several factors, including the strength of the player's breath, the tightness of the player's embouchure, the size and shape of the trumpet's bell, and the material and construction of the trumpet.

Can the sound intensity of a trumpet be changed?

Yes, the sound intensity of a trumpet can be changed by altering the player's technique, such as blowing harder or softer, and by adjusting the position of the player's lips on the mouthpiece. The type of trumpet used can also affect the sound intensity.

Is the sound intensity of a trumpet harmful to the human ear?

Yes, prolonged exposure to high sound intensity from a trumpet can potentially damage the delicate structures of the inner ear, leading to hearing loss. It is important for trumpet players and those in close proximity to them to use ear protection to prevent hearing damage.

Similar threads

Waves: Calculate the sound intensity from two speakers
    • Introductory Physics Homework Help
Replies
3
Views
2K
Max velocity of a vibrating loud speaker membrane given sound intensity
    • Introductory Physics Homework Help
Replies
4
Views
1K
Calculating τ by knowing I is proportional to A^2
    • Introductory Physics Homework Help
Replies
8
Views
2K
I Sound pressure and inverse distance law
    • Mechanics
Replies
5
Views
1K
Intensity of Stars and the Inverse Square Law Problem
    • Introductory Physics Homework Help
Replies
10
Views
2K
Calculation for finding distance with regard to sound intensity
    • Introductory Physics Homework Help
Replies
18
Views
2K
Intensity and power question (weird)
    • Introductory Physics Homework Help
Replies
7
Views
1K
Sound intensity and relationship to pressure and displacement
    • Introductory Physics Homework Help
Replies
1
Views
6K
Calculating Sound Intensity and Pressure Variation at a Distance
    • Introductory Physics Homework Help
Replies
4
Views
1K
Total sound intensity from sources
    • Introductory Physics Homework Help
Replies
11
Views
3K

Hot Threads

Recent Insights

Back
Top