DVDS Web Results

Why is there a spectrum on the back of a CD or DVD? The spectrum observed on the back of a CD or DVD is a result of diffraction, where the tracks and sectors on the disc act as a diffraction grating. This phenomenon occurs when light bends around the edges of these microscopic structures, leading to the overlapping of various colors in a continuous spectrum. The discussion confirms that the correct explanation for this visual effect is indeed ...

Some questions about humidity and storing DVDs in a closed cardboard ... The discussion revolves around the effects of humidity on storing DVDs and electronic components in closed cardboard boxes, particularly during transitions between humid and dry climates. Participants explore how moisture behaves in various materials and the implications for storage conditions. Exploratory, Technical explanation, Debate/contested One participant questions whether moisture ...

CD Players: How Do They Interfere? - Physics Forums The "reference beam" in the case of CDs and DVDs is the part of the laser beam that is reflected from the surface of the disk (aka the "land"). THe beam that goes into the pits will travel a total extra distance of 1/2 a wavelength through the plastic (so the depth of the pit must be 1/4 wavelength in the plastic).

The Many Faces of Topology - Physics Forums Topology is a branch of mathematics that encompasses many different parts. It is sometimes even difficult to see what these branches have in common or why they are all called topology.

Kinematics equations: Prove that a=vdv/ds • Physics Forums The discussion revolves around the kinematics equation a = v dv/ds, focusing on the relationship between acceleration, velocity, and displacement in one-dimensional motion. Participants explore the implications of velocity being a function of both time and space. Exploratory, Conceptual clarification, Mathematical reasoning Participants examine the application of the chain rule in deriving ...

Spatial Curvature in Cosmological Models - Physics Forums Standard cosmological models are classified by spatial curvature into three broad types: open, flat, and closed universes. These correspond to negative, zero, and positive spatial curvature respectively, and each case has distinct implications for the geometry and global volume of space.

Is mathematics invented or discovered? - Physics Forums The discussion revolves around the philosophical question of whether mathematics is invented or discovered. Participants explore various perspectives on the nature of mathematical concepts, their relationship to reality, and the implications of these views for understanding mathematics in the context of physics and other disciplines. One participant suggests that mathematics involves both ...

Pressure-Volume Work • Physics Forums The discussion revolves around the concept of pressure-volume work in a thermodynamic system involving a gas in a rigid cylinder with a piston. Participants explore the implications of gravitational force as a conservative force field and its relationship to path dependency in work done during gas compression. One participant describes a quasi-static compression process of gas in a cylinder ...

Why Do Longer Wavelengths Go Slower in Glass? - Physics Forums The discussion centers around the behavior of light in glass, specifically addressing why longer wavelengths appear to travel slower than shorter wavelengths. Participants explore concepts related to the index of refraction and the implications of this behavior in the context of prisms and gravitational effects on light. One participant expresses confusion about the relationship between ...

I'm Amazed: How Do Hard Drives Simultaneously Perform Different Tasks? One participant raises concerns about the performance impact of multitasking on hard drives, particularly when burning DVDs while accessing other files, suggesting that this could lead to interruptions. Another participant clarifies that hard drives cannot perform multiple reads simultaneously, and that random access can slow down data rates.