Question

distinguish between infrasonic and ultrasonic sounds

Answer 1

The sounds of frequency less than 20Hz are called infrasonics. The infrasonic sounds have below the lower limit of human hearing. The sound of frequency more than 20,000Hz are called ultrasonics. ultrasonic sounds have a frequency above the upper limit of human hearing.

Answer 2

INFRASONIC SOUNDS vs ULTRASONIC SOUNDS:

Infrasonic Sounds :

• These are the longitudinal pressure waves having a frequency less than 20 Hz.

• Since they are below 20 Hz , they cannot be heard by human ear.

• They are mainly used by GEOLOGISTS in order to monitor earth quakes, detect petroleum formation and rock charting.

Ultrasonic Sounds:

• These are the longitudinal pressure waves having a frequency more than 20,000 Hz.

• Since they have such a high frequency, they also cannot be heard by the human ear.

• They are used extensively in USG , which helps in imaging various organs and their pathologies. It is also used to check the condition of foetus in pregnant mother.

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