College Physics
College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Chapter 16, Problem 67PE

Astronomy Application

Energy from the Sun arrives at the top of the Earth’s atmosphere with an intensity of 1 . 3 0  kW / m 2 . How long does it take for 1.8 × 10 9 J to arrive on an area of 1.00 m2?

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Medical Application - (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 the amount of damage depends on the time duration of the exposure.
1. Energy from the Sun arrives at the top of the Earth's atmosphere with an intensity of 1.3 kW/m². How long does it take for 1.9 10° J to arrive on an area of 1 m? Time, t= S
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Chapter 16 Solutions

College Physics

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