Which sentence about particles in matter is true?
a. atoms are present in solids and liquids but not gasses
b. the particles of matter are in constant motion
c. the same kinds of atoms found in different element
d. when a solid changes to a liquid, the sizes of the particles change

B. The particles of matter are in constant motion

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.