In a ripple tank, 40 waves pass through a certain point in 1 second. If the wavelength of the wave is 5 cm, then speed of the wave is:
Correct answer: D. 2 ms-1
- A. 0.5 ms-1
- B. 1 ms-1
- C. 1.5 ms-1
- D. 2 ms-1
Explanation
Use the formula "v=fλ"As it is known that 40 waves pass through the point in 1 second so frequency is 40.Wavelength is 5cm which can be converted to 0.05m as all options are having units in ms-1(metres per second).v=(0.05)(40)v=2ms-1
This question appeared on the PMC National MDCAT 2020 paper, which you can sit online with every answer explained.
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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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