Solving Transmission Line Question: Find Phase Change Bₗ for l=0.4λ

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Homework Statement

a transmission line has a length l of 0.4lambda. find the phase change Bl that occurs down the line.

Homework Equations

B x lambda= 2pi

The Attempt at a Solution

now here is my problem i am genuinely not sure where to go with this.i don't want this answered for me that is not the idea of the forum but the next step to get me going on this would be appreciated, i can then post my answer for checking?anyone assist please?

 

[berkeman]

Homework Statement

a transmission line has a length l of 0.4lambda. find the phase change Bl that occurs down the line.

Homework Equations

B x lambda= 2pi

The Attempt at a Solution

now here is my problem i am genuinely not sure where to go with this.i don't want this answered for me that is not the idea of the forum but the next step to get me going on this would be appreciated, i can then post my answer for checking?anyone assist please?

What's B? Is it theta? $$\Theta$$

And they want to know the phase difference across 0.4 of the wavelength? Do they want it in degrees or radians?

EDIT -- BTW, I got the greek character from the Latex menu on the upper right part of the Advanced Edit/Reply page.

 

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hi there.
looking at the notes i have B is the phase change co-efficent and its in radians.thanks for advice about appropriate symbols, shall look at that.