A sound signal of 140 vibrations per second has ma wavelength of 3.5 m. What is the speed with which the wave travels?

40m/s

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0.025m/s

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490m/s

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25m/s

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Solution

The correct option is D 490m/s
Answer is C.
A sound wave has a speed that is mathematically related to the frequency and the wavelength of the wave. The mathematical relationship between speed, frequency and wavelength is given by the following equation.
Speed = Wavelength * Frequency.
In this case, the frequency is 140 per second and wavelength is 3.5 m.
Therefore, speed = 140 * 3.5 = 490 m/s.
Hence, the speed of the wave is 490 m/s.

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