Chapter 15: Problem 23
A horizontal wire is stretched with a tension of \(94.0 \mathrm{~N},\) and the speed of transverse waves for the wire is \(406 \mathrm{~m} / \mathrm{s}\). What must the amplitude of a traveling wave of frequency \(69.0 \mathrm{~Hz}\) be for the average power carried by the wave to be \(0.365 \mathrm{~W} ?\)
Short Answer
Step by step solution
Find the mass per unit length
Compute the Amplitude
Plugging in the values
Verify the result
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Tension in a wire
- In our case, the horizontal wire is under a tension of 94 Newtons (N).
- The speed of transverse waves on this wire is 406 meters per second (m/s).
- Tension is also utilized to calculate the linear mass density (μ) of the wire using the formula: \( \mu = \frac{T}{v^2} \), which integrates both tension and wave speed.
Transverse waves
- In the scenario of a wire, transverse waves move through the tensioned medium.
- These waves are reliant on the wire’s physical aspects, including its tension and mass per unit length.
- They involve disturbances in the wire that alternate between crests and troughs as they progress.
Wave amplitude
- Amplitude is related to the energy carried by the wave; larger amplitudes mean more energy.
- For a wire with transverse waves, amplitude determines how vigorously the wire is moving in relation to its static position.
- We use the power transmitted by the wave to calculate the wave's amplitude, employing the formula: \( A = \sqrt{\frac{2P}{\mu vf^2}} \).
Power in waves
- Power in longitudinal and transverse waves is the result of particle motions that carry kinetic and potential energy along the medium.
- For the wave traveling along the wire, power relates to wave amplitude, frequency, velocity, and linear mass density: \( P=\frac{1}{2}\mu vf^2A^2 \).
- This formula demonstrates how intricately power is tied to the amplitude and frequency of the wave, meaning small changes in these can significantly affect how much power a wave carries.