Concept explainers
If a wave vibrates up and down twice each second and travels a distance of 20 m each second, what is its frequency? Its wave speed? (Why is this question best answered by careful reading of the question rather than searching for a formula?)
(a)
Frequency of a wave vibrates up and down twice each second.
Answer to Problem 40A
Frequency of the wave is
Explanation of Solution
Given:A wave vibrates up and down twice in a second. The wave travels
Formula Used:Frequency
Calculation: When a wave vibrates once up and down then it completes a cycle. Frequency of a wave is calculated as the number of cycles traveled in a second. Here, a wave vibrates up and down twice in a second i.e. it completes 2 cycles in a second. Thus, the frequency of the wave is
Conclusion: Thus, frequency of the wave is
(b)
Speed of the wave vibrating up and down twice each second. This question is best answered by a careful reading of the question rather than searching for a formula.
Answer to Problem 40A
The wave speed is
Explanation of Solution
Given: A wave vibrates up and down twice in a second. Wave travels
Formula Used:Speed of sound wave is calculated as
Calculation: Since a wave travels
Since, to find the answers to the given problem no just direct formulas are necessary. But, basic physics knowledge with clear reading comprehension is also required to understand the concept.
Conclusion: Thus, the wave speed is
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Conceptual Physics: The High School Physics Program
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