Exam-style question
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A displacement-distance graph of a progressive wave shows a complete wave cycle with a wavelength of 2 m. If the wave travels at a speed of 4 m/s, what is the frequency of the wave?.
Model answer
What a good answer should say
- The frequency of the wave is 2 Hz.
Explanation
Why this works
The evidence indicates that the wavelength is 2 m and the wave speed is 4 m/s. This shows that frequency can be calculated using the formula frequency = speed / wavelength.
The implication is that substituting the given values into the formula will yield the frequency. Thus, the conclusion is that the frequency of the wave is 2 Hz.
Common mistake
No common mistake is linked to this question yet.