On a 69.0 cm diameter audio CD, digital bits of information are encoded sequenti

Question

On a 69.0 cm diameter audio CD, digital bits of information are encoded sequentially along an outward spiraling path. The spiral starts at radius 2.5 cm and winds its way out to radius 5.8 cm. To read the information, a CD player rotates the CD so that the players read out laser scans along the spiral's sequence of bits at a constant linear speed of 1.25 m/s. Thus the player must adj ust the rotational frequency of the CD as the laser moves outward. Calculate the values for frequency (in rpm) when the laser is located at the first and second radius positions.

Explanation / Answer

A. ( (1.25/.025) / (2pi) ) * 60 =477.46


B. ( (1.25/.058) / (2pi) ) * 60 =205.80

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