
Concept explainers
(i)
The nature of the propagation of the gap.
(i)

Answer to Problem 16.1QQ
Option (b) is correct.
Explanation of Solution
In a transverse wave the disturbance in the medium is perpendicular to the direction of propagation. In a longitudinal wave the disturbance in the medium is parallel to the direction of propagation.
In this case, the direction of propagation of the wave is towards the ticket window. When one person leaves, the gap is filled by the next person step forward to fill the gap it means the disturbance in the medium is also towards the ticket window.
As the disturbance in the medium and the direction of propagation both are in the same direction that is parallel to each other therefore, the propagation of gap is longitudinal.
Conclusion:
The disturbance in the medium and the direction of propagation are not perpendicular. Hence, Option (a) is not correct.
The disturbance in the medium and the direction of propagation are in the same direction. Hence, Option (b) is correct.
(ii)
The resultant pulse moves around the stadium and the pulse is (a) transverse or (b) longitudinal
(ii)

Answer to Problem 16.1QQ
Option (a) is correct.
Explanation of Solution
In a transverse wave the disturbance in the medium is perpendicular to the direction of propagation. In a longitudinal wave the disturbance in the medium is parallel to the direction of propagation.
In this case, the people stand up of sit down whereas the pulse moves either to the left or to the right. So, the disturbance in the medium and the direction of propagation of the pulse are perpendicular to each other.
The direction of propagation of the pulse and the disturbance in the medium are perpendicular to each other therefore, the pulse is transverse.
Conclusion:
The direction of propagation of the pulse and the disturbance in the medium are perpendicular. Hence, Option (a) is correct.
The direction of propagation of the pulse and the disturbance in the medium are not in the same direction. Hence, Option (b) is not correct.
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Chapter 16 Solutions
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