DVDS Web Results

Has Anyone Ever Owned/Played DVD9s? • Physics Forums Most DVDs are DVD5s, which are single-layer discs, while DVD9s are less common and feature a double-layer format. There is uncertainty regarding whether DVD9s will play on standard DVD players, with conflicting information available online. Generally, if a DVD player supports DVD-2 or DVD-3 formats, it should also be able to read DVD-9s, but compatibility can depend on the age of the player ...

A Guide to Self Study Calculus - Physics Forums We often get questions here from people self-studying mathematics. One of those questions is what of mathematics should I study and in what order.

How does the mechanism of a dual layer DVD read the data from both ... A dual layer DVD utilizes a laser that adjusts its focus to read data from two distinct layers, with the first layer being semi-transparent. The reflectivity of both layers is similar, but the upper layer absorbs some energy, affecting how the laser reads data. The differentiation between the layers relies on the laser's ability to focus accurately, allowing it to read only the layer in focus ...

CD Players: How Do They Interfere? - Physics Forums CD players utilize a laser to read information encoded in the form of pits and bumps on a disc, with the laser beam's reflection intensity varying based on these features. The discussion clarifies that while some believe interference plays a role in reading CDs, the current technology primarily relies on modulation of reflection intensity rather than interference effects. The wavelength of the ...

Kinematics equations: Prove that a=vdv/ds • Physics Forums The discussion revolves around proving the equation a = v dv/ds in the context of kinematics, focusing on one-dimensional motion where velocity is a function of time and space. Participants clarify that while acceleration can be expressed in terms of velocity and displacement, the velocity v is not constant as it changes over time. The chain rule is applied to differentiate velocity, but ...

How does a CD act like a diffraction grating? • Physics Forums A CD acts as a diffraction grating due to its microscopic bumps, which reflect light at different angles based on the light's wavelength. When white light hits these bumps, it splits into various colors because different wavelengths scatter at different angles, creating an interference pattern. This phenomenon is described by the Huygens Fresnel Principle, which explains how waves change ...

What is v(dv/dx) and how does it relate to acceleration? The discussion focuses on the expression v (dv/dx) as a model for acceleration, highlighting its derivation using the chain rule where v = dx/dt. This formulation is presented as equivalent to the traditional acceleration expression dv/dt, emphasizing its relevance in one-dimensional motion. The utility of v (dv/dx) is noted in scenarios involving air resistance and fluid dynamics, where ...

Rainbow light reflection on TV from my hand • Physics Forums The phenomenon of rainbow light reflection on a TV screen from a hand is attributed to the TV acting as a diffraction grating, where white light from the hand is split into its constituent colors. This effect can also occur with other surfaces, such as well-illuminated white paper, and is related to diffraction patterns seen on CDs and DVDs. Some participants suggest that thin film ...

Vinyl records, RPMs, and velocity. How does it work? FWIW, CDs and DVDs are recorded with the disk moving at a constant linear speed, and the rotation speed does change while the disk is playing. Because the data is recorded digitaally, it is easy for the player to "measure" how fast it is playing the disk, and so the rotation speed of a CD is actuallly controlled by the disk that is being played.

Question about whether UV light can penetrate a cardboard box Cardboard can either absorb or reflect UV light, depending on the angle of incidence. Generally, closed cardboard boxes will protect items inside from UV exposure, especially if they are indirectly illuminated. However, if there are any openings, like slits, some light may penetrate, potentially affecting sensitive items. For maximum protection, additional shielding is recommended for valuable ...