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).

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 ...

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.

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.

THERMO Spoken Here - Presented by Physics Forums Free engineering thermodynamics textbook covering Newton's mechanics, calculus, vectors, and 250+ solved physics problems.

COMSOL Student Copy: Free Academic License • Physics Forums Hello, The discussion revolves around the COMSOL Student Copy, which provides a free academic license for students. Participants emphasize the importance of adhering to forum rules, specifically regarding posting questions in designated areas. Users are encouraged to utilize search engines to find additional resources related to the COMSOL Student Copy. The conversation highlights the need for ...

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 ...

How can I contact Michio Kaku? - Physics Forums The discussion revolves around how to contact physicist Michio Kaku. Participants share suggestions and personal interactions related to this inquiry. One participant asks for ways to contact Michio Kaku. Another participant suggests visiting Kaku's official website and navigating to the contact section to send a message. There are personal exchanges between participants regarding a new role ...