Question

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 sound wave takes longer time than in previous measurements. The possible reason is:

• A. The frequency of the sonar wave, generated by the equipment is lower than previous measurements.
• B. There is a solid object of large size in the path of sonar wave.
• C. There is a huge air bubble in the path of sonar wave.
• D. The loudness of the sonar wave, generated by the equipment is lower than previous measurement.

Answer 1

The correct option is C

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

Speed of sonar wave decreases in air and so it takes longer time.