Which one of the following statements is incorrect? |
(i) A sound of frequency 1,08,000 hertz is an infrasonic sound |
(ii) If an object vibrates at the rate of 120 vibrations per second then it will produce sound audible to us. |
(iii) Ultrasonic sound can be used to study the growth of foetus inside the mother's womb. |
(iv) Human being can produce ultrasonic sound but cannot hear. |
(v) A sound can never have frequency less than 20 hertz. |
A) i, ii and iv
B) ii, iii, iv
C) i, iv and v
D) ii, iv and v
E) None of these
Correct Answer: C
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