Concept explainers
The condition which is not mandatory for mechanical waves.
Answer to Problem 1OQ
Option (b).
Explanation of Solution
All mechanical waves are the result of some kind of disturbance at a point in a medium. Waves carry energy. A wave is characterized by its wavelength, frequency, and speed. Ripples in water, sound waves etc. are some of the examples for mechanical waves.
Write the relation between frequency and wavelength of a mechanical wave.
Here,
Write the equation for speed of wave through a stretched string.
Here,
Conclusion:
A wave can have any shape. A wave of single frequency can be sinusoidal. If there exist multiple frequencies in a wave, shape will not be sinusoidal. Thus, option (b) is correct.
Some kind of disturbance is a mandatory condition for the generation of mechanical waves. For example, ripple in water is result of stone dropped in water. Thus, option (a) is incorrect.
All kind of mechanical waves possess energy. If no energy, it cannot propagate. Thus, option (c) is incorrect.
All mechanical waves require a medium to propagate. The reason why sound is not heard in moon is that it has no any medium for propagation. Thus, option (d) is incorrect.
From the above expression for
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Chapter 13 Solutions
Principles of Physics: A Calculus-Based Text
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