Lasers have useful medical applications because their light is directional (permitting tight focus of the laser beam for precise cutting), monochromatic, and intense. Carbon dioxide lasers, emitting at a wavelength of 1.06 x 10^4 nm, are typically used in surgery.
a. What are the frequency and energy (in kilojoules per mole) of a photon from a carbon dioxide laser?
Frequency: Hz
Energy: kJ/mol
The reason carbon dioxide lasers are so effective for use in surgery is that their wavelength is λ = 1.06 x 10^4 nm = 1.06 x 10^-5 m. This radiation is in the region of the spectrum, and water in the skin readily absorbs radiation of this wavelength, causing local heating and cutting.