
Concept explainers
(a)
The number of loops in the pattern
(a)

Answer to Problem 28P
The pattern exhibits a total of
Explanation of Solution
Write the expression for the wave function of a standing wave.
Here,
Write the given equation for the wave function of standing waves
Compare equation (I) and equation (II) to find the value of wave number.
Write the equation for the wave number.
Here,
Compare equation (I) and equation (II) to find the value of the angular frequency
Write the expression for the angular frequency.
Here,
Conclusion:
The distance between two adjacent nodes is half the wavelength of the standing wave. Write the equation for the distance between two adjacent nodes.
Substitute
The number of loops is the ration between the length of the wire and the distance between the two adjacent nodes. Write the equation for the number of loops.
Here,
Therefore, the pattern exhibits a total of
(b)
The fundamental frequency of vibration
(b)

Answer to Problem 28P
The fundamental frequency of vibration of the wire is
Explanation of Solution
Refer SUB-PART (a)
Conclusion:
Write the equation for the speed of the wave.
Here,
Substitute
The simplest standing wave has the distance of the wire as the distance between the adjacent nodes as they have only two nodes, one at each end.
Also, the distance between the nodes at this case is half the wavelength of the simplest standing wave.
Here,
Write the expression for the frequency of the simplest standing wave in this case.
Substitute
(c)
The number of loops in the new pattern
(c)

Answer to Problem 28P
The new pattern has
Explanation of Solution
Write the equation for the velocity in terms of the tension on the string.
Here,
Write the equation for the tension on the string when the tension is increased by
Here,
Write the new equation for the speed of the wave when the tension is increased.
Conclusion:
Substitute equation (XI) in equation (XII).
Substitute
Write the equation for the wavelength of the wave when the tension on the string is increased.
Here,
The distance between the nodes at this case is half the wavelength of the standing wave.
Substitute
Therefore, the distance between two adjacent nodes when the tension is increased is
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Chapter 14 Solutions
Principles of Physics: A Calculus-Based Text, Hybrid (with Enhanced WebAssign Printed Access Card)
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