(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Apparently the answer is sqrt(2 alpha') *4a. But doesn't equation 9.10 imply that the 4a should just be a 1?

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Zwiebach Exercise 9.3b

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