Question

the needle of a record playes moves 7.2 cm when playing a particular record if the record nakes 900 revolution, find the width of the groove

Answer 1

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Total distance covered by a needle in playing a particular record = 7.2 cms

Number of revolutions = 900

So, width of the groove = 7.2900−1=7.28997.2900-1=7.2899 = 0.00801 cm

[100 centimeter (cm) = 10,00,000 micrometer (um)

1 cm = 10000 um

0.00801 cm = 80.1 um]

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