Q1 if a parallel mirror he-ne laser had a homogeneous line, Ask an Expert

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Q1. If a parallel mirror He-Ne laser had a homogeneous line shape with v=1.5GHz, and small signal peak coefficient of .001/cm length=100cm and reflectance's 100 percent and 97 percent, how many longitudinal modes would initially contribute to the laser o/p.

Q2. The area of a typical eardrum is about 5.0 x 10^-5 m2.
Compute the sound power (the energy per second) incident on an eardrum at the threshold of hearing. And the threshold of pain?

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