Question

Given sound is ultrasonic if its frequency is (a )21ooo (b) 22 khz (C )19 and (D )both a and b

Answer 1

(D )both a and b
hope it help u

Answer 2

Heya!
Here's Your Answer
________________________________

The Audible Human Ear Range is 20Hz to
20000Hz(It's Truth)

Now, Coming To Your Question,
Ultrasonic Waves are those, Who Have Sound Frequency more than 20000 Hz
Hence,
Your Answer is both A&B
Because,
They Both Are Greater Than 20k Hz
________________________________
Hope It Helps.......!!!!
:-)