(1) 18 dBdro 403. A listener x hers a sound level of 50 dB when he is at a distance 1 km from the nstrument. Anothery at a distance 10 km from the listener x hears a sound level of(1) 30 dEB(2) 20 dBA 5 dR

(1) 18 dBdro 403. A listener x hers a sound level of 50 dB when he is

1.	(1) 18 dBdro 403. A listener x hers a sound level of 50 dB when he is at a distance 1 km from the nstrument. Anothery at a distance 10 km from the listener x hears a sound level of(1) 30 dEB(2) 20 dBA 5 dR
Answer» (1) 18 dBdro 403. A listener x hers a sound level of 50 dB when he is at a distance 1 km from the nstrument. Anothery at a distance 10 km from the listener x hears a sound level of(1) 30 dEB(2) 20 dBA 5 dR

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(1) 18 dBdro 403. A listener x hers a sound level of 50 dB when he is at a distance 1 km from the nstrument. Anothery at a distance 10 km from the listener x hears a sound level of(1) 30 dEB(2) 20 dBA 5 dR

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