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Q27. A sound of 40 dB is A. twice as loud as a sound of 20 dB. B. 4timesasloudasasoundof20dB C. 8timesasloudasasoundof20dB D. 10timesasloudasasoundof20dB E. 20 times as loud as a sound of 20 dB. F. 100 times as loud as a sound of 20 dB. G. 1000 times as loud as a sound of 20 dB Q28. Sound waves spread out from two speakers; the circles represent crests of the spreading waves. The interference is A. constructive at 1, destructive at 2 B. constructive at 2, destructive at 1 C. constructive at both points 1 and 2 D. destructive at both points 1 and 2 E. none of the above O 0

Q27. A sound of 40 dB is A. twice as loud as a sound of 20 dB. B. 4timesasloudasasoundof20dB C. 8timesasloudasasoundof20dB D. 10timesasloudasasoundof20dB E. 20 times as loud as a sound of 20 dB. F. 100 times as loud as a sound of 20 dB. G. 1000 times as loud as a sound of 20 dB Q28. Sound waves spread out from two speakers; the circles represent crests of the spreading waves. The interference is A. constructive at 1, destructive at 2 B. constructive at 2, destructive at 1 C. constructive at both points 1 and 2 D. destructive at both points 1 and 2 E. none of the above O 0

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Q27. A sound of 40 dB is A. twice as loud as a sound of 20 dB. B. 4timesasloudasasoundof20dB C. 8timesasloudasasoundof20dB D. 10timesasloudasasoundof20dB E. 20 times as loud as a sound of 20 dB. F. 100 times as loud as a sound of 20 dB. G. 1000 times as loud as a sound of 20 dB Q28. Sound waves spread out from two speakers; the circles represent crests of the spreading waves. The interference is A. constructive at 1, destructive at 2 B. constructive at 2, destructive at 1 C. constructive at both points 1 and 2 D. destructive at both points 1 and 2 E. none of the above O C O 30
Transcribed Image Text:Q27. A sound of 40 dB is A. twice as loud as a sound of 20 dB. B. 4timesasloudasasoundof20dB C. 8timesasloudasasoundof20dB D. 10timesasloudasasoundof20dB E. 20 times as loud as a sound of 20 dB. F. 100 times as loud as a sound of 20 dB. G. 1000 times as loud as a sound of 20 dB Q28. Sound waves spread out from two speakers; the circles represent crests of the spreading waves. The interference is A. constructive at 1, destructive at 2 B. constructive at 2, destructive at 1 C. constructive at both points 1 and 2 D. destructive at both points 1 and 2 E. none of the above O C O 30
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