Which technology is used in compact disks?
A. Mechanical
B. Electrical
C. Electro Magnetic
D. Laser
Answer: Option D
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Which Technology is Used in Compact Disks?
CDs are made of a thin, transparent polycarbonate plastic material that is coated with a thin layer of aluminum. The aluminum layer is reflective, which allows the CD to be read by a laser.
CDs work by using a laser to read the information stored on the CD. The laser is focused on the surface of the CD and reflects off the aluminum layer, creating a series of pits and lands on the surface of the CD.
The pits and lands represent the digital data stored on the CD, and the laser reads these pits and lands as it scans the CD. The CD player uses a motor to spin the CD at a constant speed, and a laser to read the information stored on the CD.
The laser is focused on the surface of the CD, and as the CD spins, the laser reads the pits and lands as it moves along the spiral track of the CD.
The CD player converts the data read by the laser into an electrical signal, which is then sent to the amplifier and speakers to produce sound.
CDs are a popular format for storing and playing music because they offer high-quality sound and are relatively durable and easy to use.
They are also widely used for storing and distributing data, such as software, photos, and documents, because they can hold a large amount of information in a small, portable format.😇
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