Explain why bells are made of metals or their alloys but not of wood.
6. Why do we polish metals to bring back their shine?
tivity series of metals?
Answers
1:Bells are not made of wood but of metals because when they are banged they create good sound beacuse of their property of being sonorous. Non-metals do not posses this ability.
2:Metals are polished to bring back the shine because metals tend to rust if they are kept long in the atmosphere unattended.There are a number of polishes in the market that can ensure that rusting does not take place.
Answer:
Metals are elastic than wood
Explanation:
There is a common misconception about elasticity. Many people think that if a material is elastic means it can be deformed easily. They believe that flexiblity and elasticity are the same. But that is not true.
Elasticity means the tendency of a material to restore its original form after the removal of the deforming forces.
Greater elasticity means greater restoring force and thus greater force is required to deform the material.
Wood restores itself only if the deformation is very little. If a greater deforming force is applied, then wood breaks.
If a wooden bell is struck harder to produce louder sound, then there is a possiblity that the bell will break.
Metals on the other had can retore themselves even after a comparatively greater deformation. Metals can sustain greater deformation as compared to wood. Thus, metals are more elastic than wood.
Louder sound can be made by a metal bell without damaging it.
We know that sound is produced due to vibration. The process by which the amplitude of vibration goes on decreasing and finally the vibration stops is known as damping.
If you strike a metal plate and a wooden surface to produce sound, then you'll notice that the sound due to the metal lasts for a longer time than the wood.
This shows that wood dampens vibrations faster than metal.
A metal bell can produce sound for a longer duration as compared to a wooden one.