# Ultrasonic – 1

1. The frequency of ultrasonic wave is :

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

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

1. Ultrasonic Means greater than our audible range, just like ultraviolet in case of light which is greater than visible range.. the max frequency we can here is 20khz.