Question
Medium
Solving time: 3 mins
A laser beam has a cross-sectional area of . The magnitude of the maximum electric field in this electromagnetic wave is given by [Take, permittivity of space, units and speed of light, ]
(a)
(b)
(c)
(d)
Text solutionVerified
Exp. (d)
Given,
Power of laser beam
Area of cross-section
Permittivity of free space Sl unit
Speed of light
Intensity of electromagnetic wave is given by the relation
where, is refractive index, for air .
Also,
From Eqs. (i) and (ii), we get
or
or
Given,
Power of laser beam
Area of cross-section
Permittivity of free space Sl unit
Speed of light
Intensity of electromagnetic wave is given by the relation
where, is refractive index, for air .
Also,
From Eqs. (i) and (ii), we get
or
or
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Question Text | A laser beam has a cross-sectional area of . The magnitude of the maximum electric field in this electromagnetic wave is given by [Take, permittivity of space, units and speed of light, ] (a) (b) (c) (d) |
Topic | Waves |
Subject | Physics |
Class | Class 11 |
Answer Type | Text solution:1 |
Upvotes | 69 |