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A laser emits light at power 4.71 mW and wavelength 633 nm.Thelaser beam is focused (narrowed) until its diameter matchesthe1090 nm diameter of a sphere placed in its path. The sphereisperfectly absorbing and has density 5.00 x103kg/m3. What are (a) thebeam intensityat the sphere's location, (b) theradiationpressure on the sphere, (c) the magnitudeof thecorresponding force, and (d) the magnitudeof theacceleration that force alone would give the sphere?
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 15 ns and contains 1.0 mJ of light energy.
(a) What is the power of one laser pulse?
(b) During the very brief time of the pulse, what is the intensity of the light wave?
Lasers can be used to drill or cut material. One such lasergenerates a series of high-intensity pulses rather than acontinuous beam of light. Each pulse contains 460 mJ of energy andlasts 10 ns. The laser fires 10 such pulses per second.Part A -What is the peak power of the laser light? The peak power is thepower output during one of the 10 ns pulses.Express your answer using two significant figures.Ppeak = __________WPart B -What is the average power output of the laser? The average power isthe total energy delivered per second.Express your answer using two significant figures.Pavg = _________WPart C -A lens focuses the laser beam to a 10 μm diameter circle on thetarget. During a pulse, what is the light intensity on thetarget?Express your answer using two significant figures.Ilaser = _________W/m2Part D -The intensity of sunlight at the surface of the earth at midday isabout 1100 W/m2 . What is the ratio of the laserintensity on the target to the intensity of the midday sun?Express your answer using two significant figures.Ilaser/Isun= _________