railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Physics Wave

kHz માં મનુષ્ય માટે ધ્વનિ તરંગોની શ્રાવ્ય શ્રેણી:

1
0.01 - 10
2
0.01 - 20
3
0.02 - 20
4
0.02 - 200
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