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 | Has Anyone Ever Owned/Played DVD9s? • Physics Forums
Most DVDs are DVD5s. Some - less common are DVD9s. I'm thinking of buying foreign language film that is a DVD9, but am not sure if it'd play on a normal DVD player. I've seen conflicting answers online. Some say they can always be played on regular DVD players, while others say you have...
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 | 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).
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 | Kinematics equations: Prove that a=vdv/ds • Physics Forums
You are mixing up two situations. The equation a=vdv/ds applies for a particle moving as a function of time. x=x (t), v=v (t). Yes, you can write v as a function of x, but only on the basis that the relation x=x (t) can be inverted. E.g. if x=f (t) and v=g (t) then t=f -1 (x), so v=g (f -1 (x)). The equation applies where f is a function of two independent variables, x and y. If you try to ...
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 | How does the mechanism of a dual layer DVD read the data from both ...
I read things like "When a dual layer DVD burner reads a dual layer disc, the read-laser readjusts its focus past the semi-transparent first layer of physical data, on to an additional layer of data." and "Reflectivity of both recording layers of a dual layer recordable disc is the similar...
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 | 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 ...
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 | 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 ...
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 | 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 ...
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 | 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.
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 | The Secret: Transforming Mercury to Gold Using Everyday Materials
The discussion centers on the theoretical possibility of transforming mercury into gold using everyday materials, particularly through the use of radioactive components found in electronics. Participants debate the feasibility of this process, with some arguing that the necessary nuclear reactions are too complex and cannot be achieved with common household items. The conversation highlights ...
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