13. How can ultraviolet rays be used commonly? a. Cooking food b. TVs remote control C. Sterilized medical tools d. Cell phone communication 14. What other use of UV rays can be applied in our lives? a. Tо color a рaper b. To help the plant grow C. To send message on cell phones d. To differentiate between fake and real money

13. How can ultraviolet rays be used commonly? a. Cooking food b. TVs remote control C. Sterilized medical tools d. Cell phone communication 14. What other use of UV rays can be applied in our lives? a. Tо color a рaper b. To help the plant grow C. To send message on cell phones d. To differentiate between fake and real money

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter6: The Structure Of Atoms

Section: Chapter Questions

Problem 71IL

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Similar questions

How does the energy possessed by an emitted photon compare to the difference in energy levels that gave rise to the emission of the photon?
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Answer the following questions about a Blu-ray laser: (a) The laser on a Blu-ray player has a wavelength of 405 nm. In what region of the electromagnetic spectrum is this radiation? What is its frequency? (b) A Blu-ray laser has a power of 5 millwatts (1watt=1Js1). How many photons of light are produced by the laser in 1 hour? (c) The ideal resolution of a player using a laser (such as a Blu-ray player), which determines how close together data can be stored on a compact disk, is determined using the following formula: Resolution =0.60(/NA), where A is the wavelength of the laser and NA is the numerical aperture. Numerical aperture is a measure of the size of the spot of light on the disk; the larger the NA, the smaller the spot. In a typical Blu-ray system, NA = 0.95. If the 405-nm laser is used in a Blu-ray player, what is the closest that information can be stored on a Blu-ray disk? (d) The data density of a Blu-ray disk using a 405-nm laser is 1.5107 bits mm2. Disks have an outside diameter of 120 mm and a hole of 15-mm diameter. How many data bits can be contained on the disk? If a Blu-ray disk can hold 9,400,000 pages of text, how many data bits are needed for a typed page? (Hint: Determine the area of the disk that is available to hold data. The area inside a circle is given by A=r2, where the radius r is one-half of the diameter.)
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