A laser used in LASIK eye surgery produces 55 pulses per second. The wavelength is 220.0 nm (in air), and each pulse lasts 10.0 ps. The average power emitted by the laser is 120.0 mW and the beam diameter is 0.800 mm. How many wavelengths fit in one pulse?

2: A/A transmission line of electric length 1 = 0.375 A, and operates at a frequency of 1 GHz, is terminated in a load 50-j102. The line parameters are (L= 400 nH/m), (C = 75 pF/m), (G= 15pU/m) and R = 40 mn/m, assume the Vg = 5V and Zs=20 2. Find the following for the lossless case transmission line: impedance ZL 1. The characteristic impedance (Zo) and the reflection factor at the load terminal ₁. 2. The propagation constant (y), Attenuation Coefficient (a), Phase Constant (B) and the phase velocity (vp) 3. Input impedance Zin and at the input terminal lin 4. The average power at input the transmission line Pin (Pa) and the average power delivered to the load PL(Pav). 5. If the condition of the line above is not in lossless case, prove that it case is in distortion-less.

Port-wine birthmarks, which are caused by malformed capillaries close to the skin, can be removed with laser pulses. Laser light of the right color will pass through the skin with little absorption but will be strongly absorbed by oxyhemoglobin in the blood of these capillaries, which destroys them withoutdamaging adjacent tissue. A typical system uses a series of 6900 W pulses of 585 nm laser light. Each pulse lasts 0.45 ms. How many photons are in each pulse?

Ch 24, Problem 31 The power radiated by the sun is 3.9 × 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.5 × 1011 m. The earth's axis of rotation is tilted by 23.4° relative to the plane of the orbit (see the drawing), so sunlight does not strike the equator perpendicularly. What power strikes a 0.72-m2 patch of flat land at the equator at point Q?

During normal beating, a heart creates a maximum 3.85-mV potential across 0.285 m of a person’s chest, creating a 1.1-Hz electromagnetic wave. During normal beating of the heart, the maximum value of the oscillating potential difference across 0.285 m of a person’s chest is 3.85 mV. This oscillating potential difference produces a 1.1-Hz electromagnetic wave. What is the wavelength, in meters, of the electromagnetic wave?

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Some neodymium–glass lasers can provide 100 TW of power in 1.0 ns pulses at a wavelength of 0.26 mm. How much energy is contained in a single pulse?

A spacecraft approaching a star at 4.00 E 7 m/s fires a laser at a stationary target. The beam of light has an apparent frequency of 5.04 E 16 hz. What is the wavelength of the light beam that hits the target?  a 1.26 E 9 m  b 5.95 E −9 m  c 7.94 E −10 m  d 8.24 E −9 m

A rectangular waveguide is filled with a lossless dielectric material with = 980 μ = μ₁,0 = 0. The waveguide's side lengths have the relation a = 3b. It is observed that only TE10 and TE20 modes can propagate at 1 GHz. Find the minimum and maximum values for the side length b. b 3b PEC PEC X

Pulsed lasers used for science and medicine produce very brief bursts of electromagnetic energy. If the laser light wavelength is 1062 nm (Neodymium-YAG laser), how brief would the pulse need to be to fit only one wavelenth? 5.43 x 10-12 s 3.54 x 10-15 s 5.43 x 10-15 s O 3.54 x 10-12s