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**1. Homework Statement**

A Spherical potential which is

0 for 0<r<a

Vo for r>a

Find the condition for bound states, for the radial function with l=0

Plot the result.

**3. The Attempt at a Solution**

I have gotten the equation

- tan(ka)=k/lambda

where k is the wavenumber for the wave inside the well and lambda is the wavenumber for the wave outside the wave.

I know these kind of equation have to be solved graphically or numerically. I have a similiar equation solved graphically in my textbook but I dont understand it. Can anyone please help me and give me a hint to how to solve this transcendental equation?