Sinusoidal Sound Wave Function

1. The problem statement, all variables and given/known data

A sinusoidal sound wave is described by the displacement wave function
Code:
s(x,t)=(2.00 μm)cos⁡[(15.7 m^(-1) )x-(858 s^(-1) )t]
b) Determine the instantaneous displacement from equilibrium of the elements of air at the position x = 0.050 m at t = 3.00 ms

2. Relevant equations



3. The attempt at a solution
Code:
s (x,t)=(2.00 μm)  cos⁡[(15.7 m^(-1) )(0.050m)-(858 s^(-1) )(.003 s) ]
Why is this this not correct?
 

rl.bhat

Homework Helper
4,433
5
Your substitutions are correct.
What is s = ?
 
s = 3ms
the answer is supposed to be -.433 μm
 

rl.bhat

Homework Helper
4,433
5
When you simplify the terms inside the bracket, you get 1.789 rad. To find the cos of this, either change the mode in your calculator to RAD or convert 1.789 rad to degrees and then solve for s.
 

Want to reply to this thread?

"Sinusoidal Sound Wave Function" You must log in or register to reply here.

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