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A 0.75-mW laser emits a narrow beam of light that enters the eye, as shown in the figure.
(a) How much energy is absorbed by the eye in 0.2 s?
(b) The eye focuses this beam to a tiny spot on the retina, perhaps 6.0 m in diameter. What is the average intensity of light (in W/cm2) at this spot?
(c) Damage to the retina can occur if the average intensity of light exceeds 1.0 x 10-2 W/cm2. By what factor has the intensity of this laser beam exceeded the safe value?
A laboratory ultracentrifuge is designed to produce a centripetal acceleration of 5.0 x 10^6 g at a distance of 4.00cm from the axis. What angular velocity in rev/min is necessary.
An LED is constructed from a pn-junction based on a certain GA-As-P semiconducting material whose energy gap is 1.9 eV. What is the wavelength of the emitted light
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a single mass m1 3.6 kg hangs from a spring in a motionless elevator. the spring constant is k 294.0 nm. now three
q1. a cord passes over a weightless and frictionless pulley. masses of 220 g and 389 g are attached to the ends of the
This question requires two answers. A hollow metal sphere carries a charge of 5.0 μC. How much charge is on the larger sphere
A typical adult human lung contains about 270 million tiny cavities called alveoli. Estimate theaverage diameter of a single alveolus. Assume the alveoli arespherical and a typical human lung is about 2.05 liters.
In the physics lab a metal spring is stretched 10cm vertically downward by a 500 g mass attached to it. How much would the similar spring with the same attach mass stretn themon? The mass of the moon is 7.35 x 10 to the 22kg, gravity is 1.62 m/s a..
The coefficient of kinetic friction between the rock and the surface is 0.300. Illustrate what average thermal power is produced as the rock stops?
A car accelerates uniformly from rest and reaches a speed of 22.1 m/s in 8.97 s.
For a 120-V rms 60-Hz voltage, an rms current of 70 mA passing through the human body for 1.0?s could be lethal. What must be the impedance of the body for this to occur
green laser light shines on a double slit creating a pattern of bright and dark spots on a screen some distance away.
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