Final answer:
The wavelength of a helium-neon laser beam in air is 633 nm, and this is associated with the common red laser light emitted by these lasers.
Step-by-step explanation:
The wavelength of a typical helium-neon (He-Ne) laser beam in air is 633 nm. This is the light wavelength associated with the common red color seen from these lasers, as mentioned in the provided text.
This wavelength is generated by a transition in the neon atoms that are energetically pumped by helium atoms in a metastable state. When converting this to frequency using the equation c = λv, where c is the speed of light, λ is the wavelength, and v is the frequency, we can find the frequency of this He-Ne laser light.