Ultrasonic – 2

Ultrasonic » Exercise – 1

2. The infrasonic wave have a frequency of :

(a) More than 20 kHz
(b) Less than 20 Hz 
(c) 200 Hz
(d) 20 Hz to 20 kHz

Answer
Answer : (b)

Explanation
Explanation : No answer description available for this question. Let us discuss.
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