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## Homework Statement

a)Show that the yukawa potential is a valid static-field euation

b)Show this solution also works

## Homework Equations

## The Attempt at a Solution

__Part (a)__

Using the relation given, I got

[tex]LHS = \frac{e^{-\mu r}}{r} \left[ (m^2 - \mu^2) - \frac{2\mu}{r} - \frac{2}{r^2} \right] [/tex]

So for LHS = RHS = 0, it means that ##m = \mu = -\frac{1}{r}##, so the wavefunction is ##\phi = \frac{e}{r}##.

What does this mean?

**Part (b)**

Using the relation given, I got

[tex] LHS = \left( E^2 - p^2 - m^2 \right)\phi [/tex]

For LHS = RHS = 0, it means that ## E^2 - p^2 = m^2##.

Does this mean that the particle must be on the mass shell? i.e. an external particle and

**not**an internal (virtual) particle?

What are the physical interpretations of these?