(a) What is the intensity in W/m of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 540 J of energy into a circular spot 2.2 mm in diameter in 1.5 s? Hint: The laser is a collimated beam of light and does not produce a spherical wave. w/m2 (b) Reflect on how this intensity compares to the average intensity of sunlight (about 1W/m) 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. The intensity of a laser is about damaging if they enter your eye. + times that of the sun, so clearly lasers can be very

(a) What is the intensity in W/m of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 540 J of energy into a circular spot 2.2 mm in diameter in 1.5 s? Hint: The laser is a collimated beam of light and does not produce a spherical wave. w/m2 (b) Reflect on how this intensity compares to the average intensity of sunlight (about 1W/m) 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. The intensity of a laser is about damaging if they enter your eye. + times that of the sun, so clearly lasers can be very

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter16: Waves

Section: Chapter Questions

Problem 134AP: (a) What is the intensity of a laser beam used to burn away cancerous tissue that, when 90.0%...

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Concept explainers

Electromagnetic Waves

Electromagnetic waves are waves that consist of magnetic field and electric field components perpendicular to each other. These field components are also perpendicular to the direction of propagation of the wave.

Question

1. (a) What is the intensity in w/m of a laser beam used to burn away cancerous tissue that, when
90.0% absorbed, puts 540 J of energy into a circular spot 2.2 mm in diameter in 1.5 s?
Hint: The laser is a collimated beam of light and does not produce a spherical wave.
w/m?
(b) Reflect on how this intensity compares to the average intensity of sunlight (about 1W/m) 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.
The intensity of a laser is about
damaging if they enter your eye.
times that of the sun, so clearly lasers can be very

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