Answer:
Frequency, 
Explanation:
Given that,
Wavelength of the light,
We need to find the frequency of light. We know that light is an electromagnetic wave. It moves with the speed of light. So,
f is the frequency of light
So, the frequency of light is 
. Hence, this is the required solution.
They will use pulleys or something with a wheel and axle
1) The forces of molecules is how strong they are being held together. Now, we know that solid is the last one, because it's particles are held CLOSELY and VERY TIGHTLY together, which is why it has a definite shape.And last of all, a gas's particles are held freely, which is why it has no shape. So the answer would be:- gas, liquid, solid
3) The state of matter that does not have a definite shape, but has a definite volume is a liquid. So the answer is :- liquid
7) False, an endothermic reaction is when it absorbs energy, and as we know that in a chemical reaction as the following, it tends to be an exothermic reaction, meaning that is releases energy. So the answer is:- FALSE
8) Gases have particles that are far apart (freely) and move fast. So the answer is:- They are moving very fast and are far apart.<span> </span>
D.) All of the above ...........
