A beam of green light is made to pass through two slits that are 5.0 x 10β3 meters apart. On a screen 4.0 meters away from the slits, an interference pattern appears with bands of light separated by 4.2 x 10β4 meters. What is the wavelength of the light?
3.6 x 10β8 m
5.9 x 10β7 m
5.3 x 10β7 m
3.9 x 10β6 m
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Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time βt. the resistance of the coil is r, and the total charge is q = iβt, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly βswipedβ past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be βswipedβ through the reader at exactly the right speed? why or why not?
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Physics, 22.06.2019 10:10
Which branches of natural science include the study of an organism that lived 10 million years ago
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A beam of green light is made to pass through two slits that are 5.0 x 10β3 meters apart. On a scree...
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