Physical Principles of DVD Technology

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DVD technology relies on physical principles such as laser optics, data encoding, and reflective surfaces to store and read information. The laser in a DVD player reads data encoded in pits and lands on the disc's surface, utilizing diffraction to interpret the binary information. Understanding the physics behind the laser's wavelength and the disc's material properties is crucial for grasping how DVDs function. Resources like HowStuffWorks can provide detailed explanations and insights into these concepts. Exploring these topics will enhance comprehension of the physics involved in DVD technology.
Jaar-Gilon
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I have an assignment due tomorrow (year11) about DVD Technology and physics involved. I can't seem to find any info on the Physics behind DVD Technology or anything related to the topic, if anyone has a handy website or any info on Dvd Technology and related physics that would be awesome, cheers.
 
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The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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