Teaching AWES Army Public School Mock Test General Science Physics

ଅଲଟ୍ରାସୋନିକ୍ ଧ୍ୱନିଗୁଡ଼ିକ ହେଉଛି ଧ୍ୱନି ଯାହାର କେଉଁ  ଆବୃତ୍ତି ଅଛି?

1
20 kHz ରୁ ଅଧିକ 
2
40 kHz ରୁ ଅଧିକ 
3
50 kHz ରୁ ଅଧିକ 
4
30 kHz ରୁ ଅଧିକ 
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