(a) Numberi(b) NumberProject Seafarer was an ambitious program to construct an enormous antenna, buried underground on a site about 10000 km² in area.Its purpose was to transmit signals to submarines while they were deeply submerged. If the effective wavelength were 1.6 × 103³ Earthradii, what would be the (a) frequency and (b) period of the radiation emitted? Ordinarily, electromagnetic radiations do not penetratevery far into conductors such as seawater. Take the Earth's radius to be 6370 km.MiUnitsUnits<>

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Answered: (a) Number i (b) Number Project…

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter16: Electromagnetic Waves

Section: Chapter Questions

Problem 71P: Suppose a spherical particle of mass m and radius R in space absorbs light of intensity I for time...

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(a) What is the intensity in W/m2 of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 500 J of energy into a circular spot 2.00 mm in diameter in 4.00 s?(b) Discuss how this intensity compares to the average intensity of sunlight (about 700 W/m2 ) and the implications that would have if the laser beam entered your eye. Note how your answer depends on the time duration ofthe exposure.
To measure temperatures, physicists often use the variation of intensity ofEM radiation emitted by an object. The wavelength at which the intensity isgreatest is given by the equation:λ max T = 0.2898 cm.Kwhere λ max is the wavelength of greatest intensity and T is the temperatureof the object in kelvins. In 1965, microwave radiation peaking at λ max =0.107 cm was discovered coming in all directions from space. To whattemperature, in a) K b) °C c) °F, does this wavelength correspond?
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Project Seafarer was an ambitious program to construct an enormous antenna, buried underground on a site about 10 000 km2 in area. Its purpose was to transmit signals to submarines while they were deeply submerged. If the effective wavelength were 1.0 * 10^4 Earth radii, what would be the (a) frequency and (b) period of the radiations emitted? Ordinarily, electromagnetic radiations do not penetrate very far into conductors such as seawater, and so normal signals cannot reach the submarines.
(a) What is the intensity in W/m2 of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 500 J of energy into a circular spot 2.00 mm in diameter in 4.00 s? (b) Discuss how this intensity compares to the average intensity of sunlight (about 700 W/m2 ) and the implications that would have if the laser beam entered your eye. Note how your answer depends on the time duration of the exposure.

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