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**1. Homework Statement**

I am given the equation for a standing wave with a dependence in 't' and 'z' only... I am told that the wave is propagating in a confined space (2*2*2) m

Q1. Calculate the energy density for n=1,2,3.

*I didn't have any pb with this.*

Q2. Calculate the total energy for n=1,2,3. (!!!)

**2. Homework Equations**

**3. The Attempt at a Solution**

Ok, I can't find anything in my lecture notes about total energy for waves. So I went back to the definition of energy density (h) which the amount of energy per unit of volume.

Therefore if I multiply the volume by h I should get the energy

**(right?)**

The volume here is 8 m^3

**BUT**since the wave in question is only in 1 direction (z) do I still have to multiply by V or only by L=2m instead (for this particular case)

Thanks for your answer(s)

**1. Homework Statement**

**2. Homework Equations**

**3. The Attempt at a Solution**