Read the list of substances.
Air, Copper, Glass, Gold, Wood
Which substances have high electrical conductivity?
a) Air and Copper
b) Air and Glass
c) Copper and Glass
d) Copper and Gold
c) Copper and Glass
The substances with high electrical conductivity are:
c) Copper and Glass
To determine which substances have high electrical conductivity, we need to understand the properties of the substances listed.
Electrical conductivity refers to the ability of a material to conduct an electric current. Metals generally have high electrical conductivity due to the presence of delocalized electrons that can move freely within the material.
Now, let's analyze each substance on the list:
1. Air: Air is a gas and does not conduct electricity. It is an insulator, meaning it does not allow the flow of electric current. Therefore, air does NOT have high electrical conductivity.
2. Copper: Copper is a metal and is well-known for its excellent electrical conductivity. It is widely used in electrical wiring, circuitry, and many other applications due to its efficient conduction of electricity. Therefore, copper DOES have high electrical conductivity.
3. Glass: Glass is an amorphous solid that does not conduct electricity. It is an insulator, similar to air. Therefore, glass does NOT have high electrical conductivity.
4. Gold: Gold is another metal known for its high electrical conductivity. It is used in various electronic applications, including connectors and circuits, due to its reliable conduction. Therefore, gold DOES have high electrical conductivity.
Based on the explanations above, the substances with high electrical conductivity are Copper and Gold, making option (d) the correct answer: Copper and Gold.