Question

A device called oscillator is used to send waves along a streched 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 in the string: what is their wavelength, frequency and speed.

Answer 1

Answer:

wavelength = 0.05 m

frequency = 120 Hz

speed = 6 m/s

Explanation:

wavelength = length / no of waves

= 20 /4 = 5cm = 0.05 m

frequency = vibration × number of complete waves

= 30 × 4 = 120Hz

speed = wavelength × frequency

= 0.05 × 120 = 6 m/s

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Answer 2

Explanation:

chart of length of the oscillator in cm

time required for 20 oscillation t in second

time period of oscillation t = /20sec

frequency n(Hz) =1/T(Hz)