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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?
An electron starts from rest 2.88 cm from the center of a uniformly charged sphere of radius 1.99 cm. how fast will the electron be moving when it reaches the surface of the sphere
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A 150- crate, starting from rest, is pulled across a floor with a constant horizontal force of 360 . For the first 11 the floor is frictionless, and for the next 11 the coefficient of friction is 0.31. Illustrate what is the final speed of the c..
A converging lens with a focal length of 6.00cmforms an image of a 4.00mm -tall real object that is to the left of the lens. Where are the object and image located
A ball of mass 0.113 kg is dropped from a height of 1.92m above ground. The acceleration of gravity is 9.8m/s^2.Neglecting air resistance find the speed of the ball when it is at a height of 0.812 m above the ground. Answer in units of m/s.
The air inside a bicycle tirenpumphas 202 joules of work done on it as 66.1 joules of heat is conducted away from it
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The mean distance between the Earth and the Sun is 1.50×1011 m. determine the total power radiated by the Sun
A(n) 84 g arrow is fired from a bow whose string exerts an average force of 110N on the arrow over a distance of 80cm. What is the speed of the arrow as it leaves the bow.
Using Newton's Version of Kepler's Third Law II Calculate the orbital period of the Space Shuttle in an orbit 200 above Earth's surface. Express your answer using two significant figures. T= s
What is the new acceleration of box
What is error in the simple pendulum approximation
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