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# PDEs problem - the wave equation Watch

1. Hi everyone
I can do most of my PDEs homework except the last two parts to this question I was wondering if anyone could help me out on where to start as i dont have a clue.
thanks
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2. (Original post by jonnyboy1990)
Hi everyone
I can do most of my PDEs homework except the last two parts to this question I was wondering if anyone could help me out on where to start as i dont have a clue.
thanks
For part (b), trial a solution of the form u(r,t)=T(t)R(r). Therefore, . Then, inputting this into the differential equations gives (very crudely using bad differentiation notation), . This must be equal to the seperation constant . It should all fall out from there. Part (c) is just applying the initial conditions to what you found in (b)

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