PRK Surgery Photorefractive keratectomy (PRK) is a laser-based surgical procedure that corrects near- and farsightedness by removing

Question:

PRK Surgery Photorefractive keratectomy (PRK) is a laser-based surgical procedure that corrects near- and farsightedness by removing part on the lens of the eye to change its curvature and hence focal length. This procedure can remove layers 0.25µm thick using pulses lasting 12.0 ns from a laser beam of wavelength 193nm. Low-intensity beams can be used because each individual photon bas enough energy to break the covalent of the tissue.
(a) In what part of the electromagnetic spectrum does this light lie?
(b) What is the energy of a single photon?
(c) If a l.50-mW beam is used, how many photons are delivered to the lens in each pulse?
Bonds
When companies need to raise money, issuing bonds is one way to do it. A bond functions as a loan between an investor and a corporation. The investor agrees to give the corporation a specific amount of money for a specific period of time in exchange...