Q. 29

A device called oscillator is used to send waves along a stretched string. The string is 20 cm long, and four complete waves fit along its length when the oscillator vibrates 30 times per second. For the waves on the string:
(a) what is their wavelength?

(b) what is their frequency?

(c) what is their speed?

Answer :

(a) 5cm would be their wavelength.

(b) Their frequence should be 120 Hz.


(c) Their speed should be 6m/s.

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