Physics, 16.04.2020 23:30, ellenharley7
Photorefractive keratectomy (PRK) is a laser-based surgery process that corrects near- and farsightedness by removing part of the lens of the eye to change its curvature and hence focal length. This procedure can remove layers 0.025 micrometers (E-6) thick in pulses lasting 12ns with a laser beam of wavelength 193 nm. Low-intensity beams can be used because each individual photon has enough energy to break the covalent bonds 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 1.35 mW beam is used, how many photons are delivered to the lens in each pulse?
Answers: 3
Physics, 22.06.2019 12:00, shrinu
Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter
Answers: 1
Physics, 22.06.2019 13:40, andrespiperderc
Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.
Answers: 1
Physics, 22.06.2019 16:40, Mikey5818
On your wedding day your lover gives you a gold ring of mass 3.67 g. 48 years later its mass is 3.44 g. on the average how many atoms were abrated from the ring during each second of your marriage? the atomic mass of gold is 197 u. don't enter units
Answers: 1
Photorefractive keratectomy (PRK) is a laser-based surgery process that corrects near- and farsighte...
Mathematics, 19.03.2020 23:49
Mathematics, 19.03.2020 23:49
Physics, 19.03.2020 23:49
Mathematics, 19.03.2020 23:50
Mathematics, 19.03.2020 23:50