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 0.250 μm thick in pulses lasting 12.0 ns 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. What is the energy of a single photon? 6.44 eV Ephoton Submit Part C = Previous Answers Correct If a 1.45 mW beam is used, how many photons are delivered to the lens in each p Submit [5] ΑΣΦ n= 7.88 1030 ● Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining ? photons

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 0.250 μm thick in pulses lasting 12.0 ns 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. What is the energy of a single photon? 6.44 eV Ephoton Submit Part C = Previous Answers Correct If a 1.45 mW beam is used, how many photons are delivered to the lens in each p Submit [5] ΑΣΦ n= 7.88 1030 ● Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining ? photons

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Recoil Velocity

The amount of backward thrust or force experienced by a person when he/she shoots a gun in the forward direction is called recoil velocity. This phenomenon always follows the law of conservation of linear momentum.

Question

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 0.250 um thick
in pulses lasting 12.0 ns 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.
▬▬▬
What is the energy of a single photon?
Ephoton 6.44 eV
Q Search
Submit
Part C
=
Previous Answers
Correct
If a 1.45 mW beam is used, how many photons are delivered to the lens in each p
Submit
[5] ΑΣΦ
n= 7.88 1030
●
Previous Answers Request Answer
X Incorrect; Try Again; 4 attempts remaining
P Pearson
?
4
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