(i) Sound needs a medium to travel. |
(ii) Pitch of sound increases when the frequency of vibrations increases and vice-versa. Pitch of sound is directly proportional to its frequency. |
(iii) Human beings can hear sounds only within 20-20,000 Hz. |
(iv) Shrillness of the sound is determined by the frequency of vibration. |
A) iv
B) iii
C) ii
D) i
E) None of these
Correct Answer: C
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