railway RRB Technician Grade 3 Mock Test 2024 General Science Physics

ଏକ ଶବ୍ଦ ତରଙ୍ଗର ତରଙ୍ଗଦୈର୍ଘ୍ୟ କ’ଣ ଯାହାର କମ୍ପନାଙ୍କ 820 Hz ଏବଂ ନିର୍ଦ୍ଦିଷ୍ଟ ମାଧ୍ୟମରେ ଗତି 420 ମି / ସେ ଅଟେ?

1
3.52 ମି
2
2.52 ମି
3
1.52 ମି
4
0.51 ମି
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