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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 0.250?m thick in pulses lasting 12.0ns with a laser beam of wavelength 193nm . Low-intensity beams can be used because each individual photon has enough energy to break the covalent bonds of the tissue.
A) What is the energy of a single photon?
A photon has the same momentum as an electron moving with a speed of 1.83×105 m/s. What is the wavelength of the photon
The sound level of a single vacuum cleaner is about 75dB and a television is about 55dB. What is the sound level number
Obtain an expression for the velocity
A runner's kinematics are being recorded to analyze gait. At a certain moment, the absolute angle of the trunk is 80°, What is the relative hip angle
A charge of -5.0 nC is uniformly distributed around a ring of radius 1.5 m that lies in the yz plane with its center at the origin, Calculate the work done in moving the point charge to the origin
create destructive interference between the speakers. Friction provides the force required for a car to travel around a flat, circular race track.
One cubic meter of water flowing over Niagara Falls in New York drops 96.6 meters. how much heat energy would the water have
A rocket is fired at 48m/s, in a direction 400 to the horizontal. It explodes in mid air, Find the speed of the rocket just before the explosion
Calculate the cutoff frequency of the dominant mode and determine how many modes are passed at three times cutoff frequency of dominant mode and calculate the cutoff frequency of the dominant mode
A 0.9 inch tall clock is 24 cm in front of a diverging lens which has a focal length of -33.5 cm. Paying attention to sign, answer the following questions. a. What is the image distance? cm b. What is the image's height?
A 1.50e-14 kg oil drop accelerates downwards at a rate of 1.80 m/s^2 when placed between two horizontal plates that are 9.40 cm apart. Determine the magnitude of the charge on the oil drop
A model rocket engine has an average thrust of 5.26 N. It has an initial mass of 25.9 g, which includes fuel mass of13.4 g. What is the average exhaust speed of the engine
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