A traveling wave on an infinite string, find the intensity

[LCSphysicist]

Homework Statement

I will post below.

Relevant Equations

.

The answer is about 40 Watts, but i am really not getting it:
<Pot> = 0.5((pλ)(ωA)²)v

p density linar
λ wavelength
ω angular frequency
A amplitude
v phase speed

Why is this wrong?

(I already tried too by <Pot> = Z*(ωA)²/2)

Z is impedance

 

[berkeman]

The answer is about 40 Hz

Hz is not a unit of power. Did you mean Watts?

 

[LCSphysicist]

Hz is not a unit of power. Did you mean Watts?

Opsss, yes >.< i wrote wrong

 

[Tom.G]

The Relevant Equations: has an error.
It shows '1 lb = 3[/color][/color]54 gm-wt', it should be 4[/color]54 gm-wt.[/color][/color][/color][/color]

 

[haruspex]

i am really not getting it:

Where is your working? How did you find the wavelength?
We cannot say what is wrong without seeing what you did.

 

[LCSphysicist]

Where is your working? How did you find the wavelength?
We cannot say what is wrong without seeing what you did.

v = √T/ρ = λ*f is what i am using to find the speed