For a science project, Janet performs four experiments that are supposed to show a chemical reaction. She displays her results i
n a table. In the column titled “Chemical reaction?,” which experiment’s data should be changed to “No”? Experiment 1 Experiment 2 Experiment 3 Experiment 4
1 answer:
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Answer:
r₂ = 0.2 m
Explanation:
given,
distance = 20 m
sound of average whisper = 30 dB
distance moved closer = ?
new frequency = 80 dB
using formula
I₀ = 10⁻¹² W/m²
now,
to hear the whisper sound = 80 dB
we know intensity of sound is inversely proportional to square of distances
r₂ = 0.2 m