It's very simple.
Energy =

where, h= Planck's constant = 6.6 x

c= speed of light = 3 x

m/s

= wavelength
So, energy =

= 1.65 x

J
=1.65 x

KJ
Answer:
The speed of a roller coaster increases as gravity pulls it downhill and is greatest at its lowest point. Viewed in terms of energy, the roller-coaster-Earth system's gravitational potential energy is converted to kinetic energy
Answer:
Matter can be classified according to physical and chemical properties. Matter is anything that occupies space and has mass. The three states of matter are solid, liquid, and gas. A physical change involves the conversion of a substance from one state of matter to another, without changing its chemical composition.
Explanation:
Because people make those substance out of other things