AUDIO BOOK COLLECTION

compact disk player and interference?

info:
A compact disc (CD) is read from the bottom by a semiconductor laser with wavelength 800nm passing through a plastic substrate of refractive index 1.9. When the beam encounters a pit, part of the beam is reflected from the pit and part from the flat region between the pits, so these two beams interfere with each other (the figure ).

Questions)
1)What must the minimum pit depth be so that the part of the beam reflected from a pit cancels the part of the beam reflected from the flat region? (It is this cancellation that allows the player to recognize the beginning and end of a pit. For a fuller explanation of the physics behind CD technology, see the article “The Compact Disc Digital Audio System,” by Thomas D. Rossing, in the December 1987 issue of The Physics Teacher.)

The gap must be a quarter wavelength because in order for the beams to cancel, you must have a phase change of 1/2 wavelength. If the gap is a quarter wavelength then the second beam travels 1/4 down and 1/4 back up, making the total distance traveled 1/2 wavelength longer.

1/4 of 800 is 200nm, but then you need to take into account the wavelength being shortened by the refractive index. 200 / 1.9 = 105 nm

Vintage Philips Magnavox CD-100 Compact Disc Player – 1980′s

The Family Table (Compact disc Audio) by Douglas W Phillips $4.99

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Cambridge Flyers 6 by Cambridge ESOL [Compact Disc] $40.22 Cambridge Young Learners English Tests are designed to evaluate the English level of primary learners aged 712. They provide the first step towards the Cambridge ESOL main suite exams (e.g. KET, PET, and FCE). The Audio CD contains the recordings for the Listening part of the three Flyers tests, and should be used in conjunction with the fullcolour Flyers Students Book. An Answer Booklet is also available. Author: Cambridge ESOL Series Title: Cambridge Young Learners English Tests Binding Type: Compact Disc Media Type: Audio Product Publication Date: 2010/01/01 Age Level: 08 11 Language: English Dimensions: 4.80 x 5.60 x 0.40 inches

How to Attract Money by Griswold, Bob [Compact Disc] $19.23 Prosperity begins in the mind. This highlyeffective and enjoyable CD will help you quickly break through your financial limitations and open the door to greater wealth. . You?ll learn to use your mind creatively to produce more money. This CD contains 3 programs. The first is a guided meditation with powerful imagery and techniques for achieving your ideal weight. It also includes two excellent subliminal programs, one with the sound of ocean waves and the other with relaxing original music. Author: Griswold, Bob Series Title: Love Tapes Binding Type: Compact Disc Media Type: Audio Product Publication Date: 2005/05/01 Language: English Dimensions: 5.10 x 5.66 x 1.14 inches

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