railway RRB Technician Grade 1 Mock Test 2024 General Science Physics Wave

मानवी श्रवणीय ध्वनी लहरींच्या वारंवारतेची श्रेणी किती आहे?

1
16 kHz ते 200 kHz
2
16 Hz ते 16 kHz
3
20 Hz ते 20 kHz
4
14 Hz ते 20 kHz
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