Progressive waves of frequency 300 Hz are superimposed to produce a system of stationary waves in which adjacent nodes are 1.5 m apart. What is the speed of progressive waves?
Correct answer: D. 900 m/sec
- A. 100 m/sec
- B. 200 m/sec
- C. 450 m/sec
- D. 900 m/sec
Explanation
The explanation is:Distance between adjacent nodes = λ/2 λ/2 = 1.5 --> λ = 3 mand v = fλ = (300)(3) = 900 m/s
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About Waves
Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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