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A persons vision may be improved significantly by having the cornea reshaped with a laser beam and a procedure known as photorefractive keratectomy. The excimer laser used in these treatments produces ultraviolet light with a wavelength of 193 nm. What is the difference in energy between the two levels that participate in stimulated emission in the Excimer laser? How many photons from this laser required to deliver an energy of 1.58*10^-13 J to the cornea?
Regarding standards, regulations, and guidelines define and explain mandatory and benchmark practices.
A solid metal sphere of radius a = 1.30 cm is surrounded by a concentric spherical metal shell of inner radius b = 1.90 cm and outer radius c = 2.40 cm. What is the surface charge density, sc, on the outer surface of the outer spherical conductor
A rocket is launched at an angle of 56.0° above the horizontal with the initial speed of 101 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 28.0 m/s2. At this time, its engines fail and the rocket proceeds..
You make a capacitor by cutting the 12.5 cm diameter bottoms out of two aluminum pie plates, separating them by 3.50 mm , and connecting them across a 6.00-V battery. what will be the potential difference between them
An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx=0, then what is the direction of the magnetic field? I got the positive y direction, but the answer is the negative y direction, why is ..
A lunch tray is being held in one hand, as the figure illustrates. The mass of the tray itself is 0.214 kg, and its center of gravity is located at its geometrical center. Obtain the force exerted by the thumb
Sam, whose mass is 80kg , takes off across level snow on his jet-powered skis. The skis have a thrust of 250N and a coefficient of kinetic friction on snow of 0.1, What is Sam's top speed
A block is connected between two springs on a frictionless, horizontally level track. what is the mass of the block
A point charge of +5.6 µC is placed 0.39 meter from a second point charge of -6.0 µC. Obtain the absolute magnitude of the force on each charge
A square coil containing 950 loops with a side length of 10 cm is turning in a uniform magnetic field. It is experimentally found that turning the loop at a constant speed with a period of 0.12 s produces a maximum voltage of 0.065 V. Can you writ..
After class one day, two physics learners get into an argument about rotational dynamics. Obtain the translational speed of each object when it reaches the bottom
Determine the head loss from (2) to the bottom of the aerator column, point (3), if the average velocity at (3) is V3 = 2 ft/s.
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