Which of the following materials is necessary to stop a beta particle?
a.

three feet of concrete

c.

a sheet of metal foil
b.

three inches of lead

d.

single sheet of paper

The density of a substance is 4.0 g/cm3. if a sample of the substance has a volume of 25 cm3 then what is the mass

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

Examine the nuclear reacti why is this classified as a nuclear reaction rather than a chemical reaction? it is not balanced. a new compound is formed. a change has occurred in a nucleus. a new element has been formed.