________ Hz ରୁ କମ୍ ଫ୍ରିକ୍ୱେନ୍ସି ଥିବା ଶବ୍ଦ ତରଙ୍ଗକୁ ଇନଫ୍ରାସୋନିକ୍ ତରଙ୍ଗ କୁହାଯାଏ |

1
15
2
5
3
10
4
20

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