Exam-style question
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If a string has a length of 2 m and produces a stationary wave with a fundamental frequency of 50 Hz, what is the speed of the wave?.
- A.100 m/s
- B.200 m/s
- C.50 m/s
- D.25 m/s
Model answer
What a good answer should say
- 100 m/s
Explanation
Why this works
The wave speed can be calculated using the formula: wave speed = frequency × wavelength. For the fundamental frequency, the wavelength is twice the length of the string (2 × 2 m = 4 m).
Thus, wave speed = 50 Hz × 4 m = 200 m/s.
Common mistake
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