A source of frequency "r' sends waves of wavelength "X" traveling with speed "v" in some medium. If the frequency is changed from f to "2f", then the new wavelength and new speed are (respectively):
Correct answer: C. λ/2, v
- A. 2λ, v
- B. λ, 2v
- C. λ/2, v
- D. λ, v/2
Explanation
Speed of sound in any medium depends upon the properties of the medium. In a certain medium if frequency increases then its wavelength decreases with same rate. So, speed remains constant.
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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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