• Support PF! Buy your school textbooks, materials and every day products via PF Here!

Sound Question

  • Thread starter sheri1987
  • Start date
1. The problem statement, all variables and given/known data

The distance between a loudspeaker and the left ear of a listener is 1.90 m.

(a) Calculate the time required for sound to travel this distance if the air temperature is 20°C.


2. Relevant equations
I am not sure, I tried looking in my text...but the only equation I could come up with is velocity = sqroot(ykT/m)
where y = specific heat, k is the Boltzmann constant, T is the given temp in K, and m is the distance..


3. The attempt at a solution

I have no idea where to even start, because only 2 things are known x in meters and the Temp 20 deg or 293 K. Can anyone help me out?
 

mgb_phys

Science Advisor
Homework Helper
7,744
11
You need the speed of sound in air. You can either look up the experimental real value or use the ideal gas approximation root(ykT/m) but here m is the molar mass of air not the distance!
You then use speed and distance to get the time.
 
what equation can you solve for time by having speed and distance?
 

mgb_phys

Science Advisor
Homework Helper
7,744
11
what equation can you solve for time by having speed and distance?
Did you realy mean to write that!
What is the definition of speed?
 

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top