Tag: different sounds

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Multiple choice physics sound audible, infrasonic and ultrasonic sounds different sounds range of hearing

Which of the following frequencies of sound elephants produce ?

  1. ultrasonic

  2. infrasonic

  3. both A & B

  4. cant say
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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 $20 Hz$ (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. 

Multiple choice physics sound audible, infrasonic and ultrasonic sounds different sounds range of hearing

Name the sounds of the frequencies given below $10Hz$.

  1. $ultrasonic$

  2. $infrasonic$

  3. $supersonic$

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Infra-sound is a low-frequency sound. It is sound that is lower in frequency than $20 \ Hz$ or cycles per second, the normal limit of human hearing. Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. The ear is the primary organ for sensing infra-sound, but at higher intensities it is possible to feel infra-sound vibrations in various parts of the body.

Multiple choice physics sound audible, infrasonic and ultrasonic sounds different sounds range of hearing

Infrasound can be heard by

  1. dog

  2. bat

  3. rhinoceros

  4. human beings
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rhinos have extremely good ears, picking up infra-sound far deeper than the range of human hearing.
Rhinos, can hear down to a frequency of four hertz, whereas even a human baby, with entirely undamaged ears, can normally only pick up sounds as low as 20 hertz. Giraffes and elephants can also hear in this infra-sound range.