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A ship sends a sonar wave to the sea bed which is flat and measured several times over a large area. One day the reflected shound wave takes longer time than in previous measurements. The possible reason is :

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the loudness of the sonar wave, generated by the equipment is lower than previous measurement.

There is a solid object of large size in the path of sonar wave.

The frequency of the sonar wave, generated by the equipment is lower than previous measurements.

there is a huge air bubble in the path of sonar wave.

answer is C.

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