Single correct option
A sound wave has a frequency of 500 Hz and a wavelength of 0.68 m. The speed of the wave is
- A. 735 m/s
- B. 170 m/s
- C. 340 m/s
- D. 0.00136 m/s
Show answer and solution
Answer: (C) 340 m/s
Wave speed v = frequency x wavelength = 500 x 0.68 = 340 m/s, which is the speed of sound in air at about room temperature. Dividing the frequency by the wavelength gives 735 m/s, which is the usual slip, and multiplying by the wrong factor gives the other values.
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