Question

1 Ektard OR a toy telephone

2 A simple elèctrascop​

Answer 1

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An electroscope is a device that is used to test if an object is carrying a charge or not. It consists of 2 metal leaves that are connected to a metal rod which in turn is connected to a disc. Whenever an object strikes the electroscope which has a positive charge, the same positive charge will be conducted to the leaves. These leaves are metallic and as they carry the same charge so they repel each other. When the leaves move away from each other this means the object is a charged body and if they come close to each other this implies the object is uncharged.

Answer 2

• Liquids: Sound travels faster in liquids than in gases because molecules are more tightly packed. ... Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it.