Chapter 5: Q17E (page 1181)
In a two-slit interference pattern, the intensity at the peak of the central maximum is
Short Answer
- The intensity is
. - The path difference from the two slits is
.
Chapter 5: Q17E (page 1181)
In a two-slit interference pattern, the intensity at the peak of the central maximum is
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Get started for free34.12 For a concave spherical mirror that has focal length f=+18 cm, what is the distance of an object from the mirror’s vertex if the image is real and has the same height as the object?
Light of wavelength
Huygens’s principle also applies to sound waves. During the day, the temperature of the atmosphere decreases with increasing altitude above the ground. But at night, when the ground cools, there is a layer of air just above the surface in which the temperature increaseswith altitude. Use this to explain why sound waves from distant sources can be heard more clearly at night than in the daytime. (Hint:The speed of sound increases with increasing temperature. Use the ideas displayed in Fig. 33.36 for light.)
For the situation shown in Fig. 34.3, is the image distance s′ positive or negative? Is the image real or virtual? Explain your answers
34.13 Dental Mirror. A dentist uses a curved mirror to view teeth on the upper side of the mouth. Suppose she wants an erect image with a magnification of 2.00 when the mirror is 1.25cm from a tooth. (Treat this problem as though the object and image lie along a straight line.) (a) What kind of mirror (concave or convex) is needed? Use a ray diagram to decide, without performing any calculations. (b) What must be the focal length and radius of curvature of this mirror? (c) Draw a principal-ray diagram to check your answer in part (b).
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