Sunday , March 18 2018

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

Answer : (a)

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

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One 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.

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