Physics of Sound & Music NEED HELP

In summary, the conversation is asking for help in solving a question about the amplitude of a pressure wave, given that the atmospheric pressure is 0.850 atm and the rarefactions of a sound wave reduce the pressure to 0.841 atm. The person responding suggests defining terms and showing work before providing guidance.
  • #1
Brandi10
1
0
Does anyone know how to solve this question?

The atmospheric pressure is 0.850 atm. The rarefactions of a particular sound wave then reduce the pressure to 0.841 atm, what is the amplitude of the pressure wave expressed in metric units N/m2(squared)?
 
Physics news on Phys.org
  • #2
Welcome to PF forums! If you've looked around, I believe you will find some very useful and interesting discussions as well as helpful people. Before we can give you some guidance, you will need to show us some work. What is your thought process so far, and attempt at a solution? (please reread the sticky https://www.physicsforums.com/showthread.php?t=94379 at the top of the forum page). You might start by defining some terms. What does rarefaction mean in your example?
 
  • #3


To solve this question, we can use the formula for sound pressure level (SPL) which is SPL = 20log(P/P0), where P is the sound pressure and P0 is the reference pressure, usually taken as 20 micropascals (μPa). In this case, P0 = 0.850 atm = 102,072.93 μPa.

To find the amplitude, we can rearrange the formula to P = P0 x 10^(SPL/20). Plugging in the values, we get P = 102,072.93 x 10^(20log(0.841/0.850)/20) = 101,215.92 μPa.

Converting to metric units, we get 101,215.92 μPa = 101,215.92 N/m^2.

Therefore, the amplitude of the pressure wave is 101,215.92 N/m^2.
 

1. What is the difference between sound and music?

The main difference between sound and music is that sound is a physical phenomenon that can be measured and analyzed, while music is a human perception and experience of organized sound. Sound is a vibration that travels through a medium, whereas music is created by arranging and organizing sounds in a deliberate manner to create a specific emotional or aesthetic effect.

2. How does sound travel through different mediums?

Sound is a mechanical wave that requires a medium to travel through. The speed of sound depends on the properties of the medium, such as density, elasticity, and temperature. In general, sound travels faster through denser and more elastic mediums, such as solids, and slower through less dense and less elastic mediums, such as gases.

3. What is the relationship between frequency and pitch in sound?

Frequency is the number of vibrations or cycles per second of a sound wave, and it is measured in Hertz (Hz). Pitch, on the other hand, is a subjective perception of how high or low a sound is, and it is closely related to frequency. Generally, the higher the frequency of a sound wave, the higher the perceived pitch will be.

4. How do musical instruments produce sound?

Musical instruments produce sound by creating vibrations in a specific medium, such as air or strings. These vibrations are then amplified and propagated through the air as sound waves. The type of instrument and the materials used contribute to the unique characteristics and qualities of the sound produced.

5. How does the Doppler effect affect sound and music?

The Doppler effect is a phenomenon where the frequency of a sound wave appears to change when the source of the sound is moving relative to the observer. This effect is commonly observed in everyday life, such as the change in pitch of a siren as an ambulance passes by. In music, the Doppler effect can be used to create a sense of movement or change in the perception of sound by manipulating the frequency of the source relative to the listener.

Similar threads

  • Introductory Physics Homework Help
Replies
20
Views
2K
  • Introductory Physics Homework Help
Replies
3
Views
203
  • Introductory Physics Homework Help
Replies
6
Views
319
  • Mechanical Engineering
Replies
18
Views
2K
Replies
31
Views
719
  • Introductory Physics Homework Help
Replies
1
Views
2K
  • Introductory Physics Homework Help
Replies
8
Views
936
Replies
16
Views
2K
  • Introductory Physics Homework Help
Replies
2
Views
1K
Replies
8
Views
2K
Back
Top