The answer to the question is b because acid is a substance that tastes sour, reacts with metal and turns litmus paper blue
I'm sorry but I don't really understand the question. What is the quest actually asking???
propagated disturbance is a variation
Answer:
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Sound created in a big hall will persist by repeated reflection from the walls until it is reduced to a value where it is no longer audible. The repeated reflection that results in this persistence of sound is called reverberation. In an auditorium or big hall excessive reverberation is highly undesirable
Explanation:
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