Discussion
Assertion (A): A recorder carries an acoustic beacon rather than a radio one.
Reason (R): Radio frequencies do not propagate usefully through sea water.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second is the reason for the choice. Sea water conducts, and radio frequencies are attenuated within a very short distance of the surface - nothing from a submerged beacon reaches a receiver or a satellite.
Sound propagates well, so the beacon emits an acoustic pulse at 37.5 kHz that a hydrophone detects at a mile or two. It is the medium that dictates the physics, not a preference of the designers.
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