Answers

2015-02-07T19:29:54+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
ultrasonic sound -  sound of frequency of more than 20000 Hz which cannot be heard by human ears . but a human child infant can  hear upto 25000Hz and animals can be hear more than 20000 Hz .  e.g. dogs ( upto 50000 Hz ) , cats , bats ,etc.

1 5 1
2015-02-07T19:52:15+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
The term "ultrasonic sound"  refers to sound above the frequencies of audible sound, and nominally includes frequency over 20,000 Hz. 

Bats use ultrasound to catch insect in night
ultra sound machine is used to detect fatigue
 

Infant can hear from 16 Hz to 20000 Hz

0