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Chapter 27: Q1CQ (page 994)

What type of experimental evidence indicates that light is a wave?

Short Answer

Expert verified

We discover the nature of light with the help of phenomena of diffraction and interference.

Step by step solution

01

Concept Introduction

A wave is a disturbance or variation in a medium that carries energy from point to point.

02

Explanation

Diffraction and interference help us understand the nature of light.

The number of apertures (of very small size) through which light is refracted distinguishes diffraction from interference. Lights diffracted apertures interfere with each other and create constructive and destructive patterns, and this proves that light is a form of a wave.

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Most popular questions from this chapter

Figure 27.56shows a double slit located a distance xfrom a screen, with the distance from the center of the screen given by y. When the distance dbetween the slits is relatively large, there will be numerous bright spots, called fringes. Show that, for small angles (where 蝉颈苍胃鈮�胃, with 胃 in radians), the distance between fringes is given by 鈭�y=x位/d.

A non-reflective coating like the one described in Example 27.6 works ideally for a single wavelength and for perpendicular incidence. What happens for other wavelengths and other incident directions? Be specific.

(a) What is the minimum width of a single slit (in multiples of 位 ) that will produce the first minimum for a wavelength 位 ? (b) What is its minimum width if it produces 50 minima? (c) 1000 minima?

(a) Find the angle of the third diffraction minimum for 633鈥�nmlight falling on a slit of width 20.0渭尘.

(b) What slit width would place this minimum at 85.0掳? Explicitly show how you follow the steps in Problem-Solving Strategies for Wave Optics.

Figure 27.55 shows the central part of the interference pattern for a pure wavelength of red light projected onto a double slit. The pattern is actually a combination of single slit and double slit interference. Note that the bright spots are evenly spaced. Is this a double slit or single slit characteristic? Note that some of the bright spots are dim on either side of the center. Is this a single slit or double slit characteristic? Which is smaller, the slit width or the separation between slits? Explain your responses.
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