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Is Matter Around Us Pure
What is reverberation? How can it be reduced?
The repeated reflection that results in this persistence of sound is called reverberation. A 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.
Reverberation can be reduced by following methods:
(i) By covering the walls and roof of the halls with sound absorbing materials.
(ii) By providing heavy curtains with folds, so that reflection of the sound is avoided.
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Which separation techniques will you apply for the separation of the following?
Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
Which separation techniques will you apply for the separation of the following?
Small pieces of metal in the engine oil of a car.
Which separation techniques will you apply for the separation of the following?
Different pigments from an extract of flower petals.
Which separation techniques will you apply for the separation of the following?
Butter from curd.
Write the steps you would use for making tea. Use the words—solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
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