Answer:
true
Explanation:
It's true man..............true.........
Ra (radium) is the most reactive
Answer:
Heating a certain substance causes molecules to speed up and spread slightly further apart, having a larger volume that results in a decrease in the density. Cooling a substance causes molecules to slow down and get closer together, occupying a smaller volume that results in the increase in density.
Explanation:
The correct answer should be D) The frequency of Wave 2 is double the frequency of Wave 1.
This is because the frequency is how many waves there is in an amount of time, so 10 waves in 1 second has double the frequency of 5 waves in 1 second.
Hope that helps!
