Questions: On a digital video disc (DVD), video and audio data are stored in a series of tiny pits that are evenly spaced along a long spiral that traverses most of the surface of the disc. The scanning laser in a DVD player must read this information at a constant rate. As the player reads information recorded closer and closer to the outer edge of the DVD, the disc rotates at the same speed. rotates slower. rotates faster.

Solution Steps

A DVD stores data in a spiral track, and the laser reads this data at a constant linear speed. This means the rate at which data is read (in terms of bits per second) remains constant.

As the laser moves from the inner tracks to the outer tracks, the circumference of the track increases. To maintain a constant linear speed of data reading, the rotational speed must adjust.

Since the outer tracks have a larger circumference, the disc must rotate slower to ensure the laser reads the data at the same linear speed. If the disc rotated at the same speed, the laser would read data too quickly on the outer tracks.

Final Answer