Radius of hellical chain( radius of path of electron)?

1. The problem statement, all variables and given/known data

here’s the question, is my concept correct? the ans is 9.86 cm, but my ans is 13 cm, can anyone tell me which part is wrong?

2. Relevant equations

3. The attempt at a solution

Attached Images
File Type: jpg DSC_0115~3[2].jpg (46.7 KB)


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