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## Homework Statement

## Homework Equations

2. (b)

I didn't understand how can I find the app. wavelength

## The Attempt at a Solution

I tried : the electron move over λ

_{u}with velocity β so the wavelength is λ≈λ

_{u}/β

but its not the right answer.

my lecturer told me I should consider also the dopler

I only know that the answer is :

λ≈λ

_{u}/(2*γ

^{2})

γ= gamma

THANK YOU!