# What Is The Radius Of A Cd?

Compact disk is in the shape of a circle. Hence the circumference of a compact disk can be equated to that of a circle. We know that Circumference of a circle is 2πr, where r is the radius of the circle. Hence the radius of the compact disk ( CD ) is 4.5 cm.

## What is the diameter of a CD?

A standard CD is 120 mm (4.75 inch) in diameter and 1.2 mm (0.05 inch) thick.

## What is the circumference of a CD disc?

The circumference of a compact disc is 28.26 centimeters.

## Why is a CD 74 minutes long?

The original target storage capacity for a CD was one hour of audio content, and a disc diameter of 115 mm was sufficient for this, however both parties [Sony and Philips] extended the capacity to 74 minutes to accommodate a complete performance of Beethoven’s 9th Symphony.

## Are all CDs the same size?

Disc shapes and diameters Standard CDs are available in two sizes. By far, the most common is 120 millimetres (4.7 in) in diameter, with a 74- or 80-minute audio capacity and a 650 or 700 MB (737,280,000-byte) data capacity.

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## How many times can a CD be played?

In short, no. Optical media like CDs and DVDs does not wear out from repeated use. It can degrade or become damaged, however. CDs and DVDs can degrade over time because their recording layers are made with a dye that is extremely photosensitive; it deteriorates when exposed to UV rays over time.

## How do you find a circumference?

To find the circumference of a circle, multiply the circle’s diameter by pi (3.14).

## What is the capacity of a CD?

With a storage capacity of 680 megabytes, the CD-ROM found rapid commercial acceptance as an alternative to so-called floppy disks (with a maximum capacity of 1.4 megabytes).

## How do you calculate disk?

Calculate Disc/Circle measurements

2. Diameter. 2 × r.
3. Circumference. 2 × π × r.
4. Area. π × r2

## Are CDs the same size as DVDs?

Answer: A good question, since, you know, DVDs and CDs are the same bloody size. From a marketing standpoint, it was important for DVDs and CDs to come in different case sizes, so each was distinct.

## How wide is a disk?

Disc golfers get used to certain widths and like to find other discs of similar size. Discs with very wide rims can be hard for many disc golfers to control. Of the discs we sell, the average rim width for distance drivers is 2.11 centimeters, 1.67cm for fairway drivers, 1.27cm for mid range discs, and.

## What is the size of CD and DVD?

The acquire size of CD is 700 MB. While the acquire size of DVD is 4.7 GB to 17 GB. 2. In CD, the recording or metal layer is situated on the top of disk.

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## Why do CDs only hold 80 minutes?

This is uncompressed audio data, and it requires a lot more space than MP3 files, AAC files, or any other type of compressed audio file. A minute of CDDA audio always takes up the same amount of space on the disc, which is why you can only burn a maximum number of minutes to a disc.

## Why is a CD 70 minutes?

The real limit for CDs started at 72 minutes, not 74 minutes, since this was the maximum length of the U-Matic videotapes which were used for audio masters. 9 would have to wait until 1997 before technological developments would allow it to be released on a single CD.

## Do CDs wear out?

Do they wear out? Answer: Few things changed our digital lives like CDs and DVDs, especially when it became affordable to make our own discs. They don’t “wear out” in the same way a cassette tape or vinyl record used to wear out because there is no physical contact with the recording service, but they do deteriorate.