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##### Example 2.4There are 48 holes in a disc sircn arranged in the form of a ring. The disc rotates at 400 revolutions per half minute. What is the frequency of the sound emilted by an air jet placed against the holes.

2.2 Fill in the blanks.(vii) Longitudinal waves consist of ___ and and as they pass through a medium the particles of the medium vibrates in the of the waves.

16.20 Discuss in detail the light emitting diodes?

Hole is equivalent to:A) A neutral particleB) A positive chargeC) A negative chargeD) An electron

10.4. A simple pendulum completes one vibration in two seconds. Calculate its length when g=10.0 \mathrm{~ms}^{-2} .Ans. (1.02 m)

10.1. If the length of a simple pendulum is doubled what will be the change in its time period?

2.4 Pick out true and false.(iv) Force applied to a spring is inversely proportional to the extension in the spring.