Which statement about ultrasound is correct?
A It is produced by a rapidly vibrating source.
B It is uncomfortable to human ears.
C Its frequency must be greater than 300 kHz.
D It travels the fastest in a vacuum.
Answers
Answered by
3
Answer:
A
Explanation:
D is false as sound doesn't travel in vacuum.
C is false as an ultrasonic sound should have frequency above 20 kHz not 300 kHz.
B is false because humans can't hear ultrasonic sounds in the first place.
So, A is true.
An ultrasonic sound is a sound of frequency > 20 kHz produced by a rapidly vibrating body.
Answered by
1
Answer:
A
Explanation:
others false
mark me brain list
Similar questions