Physics, 23.08.2019 05:30 TylerBerk5309
Optical data storage cd players use an objective with na=0.45, and laser wavelength i=780nm, whereas the new blu-ray disc players use na=0.85, 1=405nm. a) what is the spot size for cd players b) what is the spot size for bluray players (use same formula asi) c) calculate the ratio of the focal spot area for the blu-ray disc player compared to cds (ie., ratio = a bluray / a cd) d) assuming that the total information on the disc scales inversely with spot area, what would this predict for the number of gigabytes for a bluray disc (cd roms are 700mb (1 mb = 1 million bytes)? e) is the spot-size reduction itself enough to explain the increased data storage of bluray discs? 1) what else could account for the difference?
Answers: 2
Physics, 22.06.2019 21:00, violetagamez2
Identify some abiotic characteristics of the tundra biome.
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Physics, 23.06.2019 08:30, pickelswolf3962
The lift raises a car of mass 850 kg to a height of 2.1 m. it uses a force of 8330 n and takes 4 seconds to raise the car. what is the power of the lift?
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Physics, 23.06.2019 09:30, jonathanjenkins701
The vector a? is 3.50 cm long and is directed into this page. vector b? points from the lower-right corner of this page to the upper-left corner of this page and has the components bx=-19.5 cm , by=25 cm. in the right-handed coordinate system, where the +x-axis directed to the right, the +y-axis toward the top of the page, and +z-axis out of the page, find the x-component of the vector product a? ×b? , measured in cm2.
Answers: 1
Optical data storage cd players use an objective with na=0.45, and laser wavelength i=780nm, whereas...
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