Josie sees lightning off in the distance. a few seconds later she hears thunder. what can josie conclude?

a. sound waves do not travel long distances.

b. light waves travel faster than sound waves.

c. sound waves are weaker than light waves.

d. waves last longer than sound waves.

Light waves travel faster than sound waves.

:)

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.