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Is Matter Around Us Pure
What is reverberation? How can it be reduced?
The waves suffer multiple reflections from the walls, ceilings and other materials present, when a sound is produced in a big hall or auditorium. As a result of this, sound persists for some time even after the source has stopped producing sound.
Revertebration is the process of persistence of sound due to repeated reflection.
Methods of reducing reverberation.
In a big hall or auditorium, excessive reverberation is highly undesirable. The following below methods can be used to reduce them.
(i) By covering the walls and roof of the auditorium with sound absorbent materials like compressed fireboard, rough plaster, etc.
(ii) Providing open windows in the space.
(iii) Providing heavy curtains with folds, so that the sound gets absorbed.
(iv) By using good sound absorbing materials for the seats.
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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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