If stretching force T of wire increases, then its frequency __________________?
Correct answer: B. increases
- A. decreases
- B. increases
- C. remains the same
- D. any of above
Explanation
For a stretched wire, the frequency is proportional to the square root of its tension, f = (1/2L)√(T/μ). Therefore, increasing the stretching force increases the frequency, assuming the length and mass per unit length remain fixed. The likely mistake is choosing decreases, which reverses the dependence on tension.
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About Stationary Waves
Stationary waves form when two waves of the same frequency and amplitude travel in opposite directions and interfere. The topic covers nodes, antinodes, wavelength, phase, resonance, and the allowed frequencies on strings and in air columns. Unlike progressive waves, stationary waves do not transfer energy from one point to another.
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