A laser is used in eye surgery to weld a detached retina back into place. The...
A laser is used in eye surgery to weld a detached retina back into place. The wavelength of the laser beam is 478 nm, while the power is 2.0 W. During surgery, the laser beam is turned on for 0.048 s. During this time, how many photons are emitted by the laser?
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A laser is used in eye surgery to weld a detached retina back
into place. The...
Chapter 30, Problem 45 A laser is used in eye surgery to weld a detached retina...
Chapter 30, Problem 45 A laser is used in eye surgery to weld a detached retina back into place. The wavelength of the laser beam is 467 nm, while the power is 1.8 W. During surgery, the laser beam is turned on for 0.042 s. During this time, how many photons are emitted by the laser? Number Units The number of significant digits is set to 3; the tolerance is +/-3% LINK TO TEXT
Very short pulses of high-intensity laser beams are used to repair detached portions of the retina...
Very short pulses of high-intensity laser beams are used to repair detached portions of the retina of the eye. The brief pulses of energy absorbed by the retina welds the detached portion back into place. In one such procedure, a laser beam has a wavelength of 810 nm and delivers 250 mW of power spread over a circular spot 510 μm in diameter. The vitreous humor (the transparent fluid that fills most of the eye) has an index of refraction...
A surgeon is attempting to correct a detached retina by using a pulsed laser. (a) If...
A surgeon is attempting to correct a detached retina by using a pulsed laser. (a) If the pulses last for 40.0 ms and if the output power of the laser is 0.700 W, how much energy is in each pulse? 28 m] (b) if the wavelength of the laser light is 646 nm, how many photons are present in each pulse? 3.28e16
A laser used to weld detached retinas emits light with a wavelength of 652 nm in...
A laser used to weld detached retinas emits light with a wavelength of 652 nm in pulses that are 20.0 ms in duration. The average power expended during each pulse is 0.600 W.1) How much energy is in each pulse, in joules?2)How much energy is in each pulse, in electron volts?3)What is the energy of one photon in joules?4)What is the energy of one photon in electron volts?5)How many photons are in each pulse?
A laser used in LASIK eye surgery produces 50 pulses per second. The wavelength is 192...
A laser used in LASIK eye surgery produces 50 pulses per second. The wavelength is 192 nm (in air) and each pulse lasts 11 ps. The average power emitted by the laser is 122.8 mW and the beam diameter is 0.8 mm. (a) In what part of the EM spectrum is the laser pulse? The wavelength of the laser light is longer/shorter than visible light. (b) How long (in centimeters) is a single pulse of the laser in air? d...
An Nd-YAG (lambda = 1064nm) laser used in eye surgery emits a 1.00mJ pulse in 1.00...
An Nd-YAG (lambda = 1064nm) laser used in eye surgery emits a 1.00mJ pulse in 1.00 microsecond. The laser beam has a diameter of 2mm. The focusing system of the eye has a focal length of about f=20mm. a)Find the power density (in W/m2) on the cornea of the eye during one pulse. b) Find the power density (in W/m2) delivered to the retina by one pulse.
(60) 2. The Nd:YAG laser is used in eye surgery called posteriour capsulotomy, following cataract surgery,...
(60) 2. The Nd:YAG laser is used in eye surgery called posteriour capsulotomy, following cataract surgery, to correct cloudiness that affects vision. The laser emits light with a wavelength of 1064 nanometers (nm) in the infrared region of the electro-magnetic spectrum. Each laser pulse has 40.5 J of energy, contains many photons, and the pulse lasts for 30.5 nanoseconds (ns). (15) 2a. Determine the frequency of the 1064 nm Nd:YAG light. (15) 2b. Determine the energy of each photon (J/photon)...
A laser used in eye surgery emits a 2.20-mJ pulse in 1.00 ns, focused to a...
A laser used in eye surgery emits a 2.20-mJ pulse in 1.00 ns, focused to a spot 45.0 µm in diameter on the retina. (a) Find (in SI units) the power per unit area at the retina. (This quantity is called the irradiance.) W/m2 (b) What energy is delivered per pulse to an area of molecular size (say, a circular area 0.400 nm in diameter)? J
LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping...
LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.0-mm-diameter laser beam with a wavelength of 193 nm. Each laser pulse lasts 10 ns and contains 2.0 mJ of light energy. Part A) What is the power of one laser pulse? Express your answer with the appropriate units. Part B) During the very brief time of the pulse, what is the intensity of the light wave?...
LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping...
LASIK eye surgery uses pulses of laser light to shave off tissue from the cornea, reshaping it. A typical LASIK laser emits a 1.0-mm-diameter laser beam with a wavelength of 193 nm. Each laser pulse lasts 20ns and contains 1.7mJ of light energy. What is the power of one laser pulse? During the very brief time of the pulse, what is the intensity of the light wave?
Chapter 30, Problem 45 A laser is used in eye surgery to weld a detached retina back into place. The wavelength of the laser beam is 467 nm, while the power is 1.8 W. During surgery, the laser beam is turned on for 0.042 s. During this time, how many photons are emitted by the laser? Number Units The number of significant digits is set to 3; the tolerance is +/-3% LINK TO TEXT
A surgeon is attempting to correct a detached retina by using a pulsed laser. (a) If the pulses last for 40.0 ms and if the output power of the laser is 0.700 W, how much energy is in each pulse? 28 m] (b) if the wavelength of the laser light is 646 nm, how many photons are present in each pulse? 3.28e16
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