Question

Which of the following frequencies of sound elephants produce ?

• A. ultrasonic
• B. infrasonic
• C. both A & B
• D. cant say

Answer 1

The correct option is B infrasonic

Some of the elephant's vocalizations are infrasonic, and thus are inaudible to humans. The prominence of very low frequencies in the vocalizations is a defining characteristic of all three species of elephants. Sounds are generally considered to be infrasonic if their frequency is less than $20Hz$ (the lower limit of human hearing). Low frequency sounds travel farther than high frequency ones, which make them ideal for long distance communication.
Hence, Elephants produce infrasonic sound.