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College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

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BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

Unreasonable Results

To save money on making military aircraft invisible to radar, an inventor decides to coat them with a non-reflective material having an index of refraction of 1.20, which is between that of air and the surface of the plane. This, he reasons, should be much cheaper than designing Stealth bombers. (a) What thickness should the coating be to inhibit the reflection of 4.00-cm wavelength radar? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?

(a)

To determine

Thickness of the coating to inhibit the reflection

Explanation

Given info:

Refractive index of film coating, n=1.20

Wavelength of the radar, λ=4cm

Formula used:

Thickness of the film producing destructive interference is calculated by the formula

  2t=λ4n

Here,

  λ is the wavelength of the reflected light

  n is the refractive index

  t is the thickness of

(b)

To determine

The factor that unreasonable about this result.

(c)

To determine

Assumptions that are unreasonable.

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Chapter 27 Solutions

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