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**1. Homework Statement**

A magnetic-field technique for stabilizing a He-Ne laser to 2 parts in 10^10 has been patented. At 632.8 nm, what would be the coherence length of a laser with such frquency stability.

**2. Homework Equations**

Coherence time =1/delta frequency

coherence length = c/delta frquency

**3. The Attempt at a Solution**

dont know what 10^10 stands for and how to solve this

help would be much appreciated.