Nuclear Physics: Crash Course Physics #45

What is the number of protons in an atom usually called?

• Nucleus

• Atomic Number

• Electrons

• Mass Number

How many neutrons does a C-14 nucleus contain?

• 6

• 8

• 14

• 12

What is the name of atoms when they have same atomic number (protons) but different mass number (protons + neutrons)?

• Rare elements

• Nuclei

• Isotopes

• Carbon atoms

An atomic nucleus has ______ mass than the sum of its individual constituent parts.

• no difference in

• less

• more

The "glue" that holds together the nucleus (even against the repulsive electrical repulsion between the protons) is called ____.

• gravity

• the strong nuclear force

• the weak nuclear force

• the electromagnetic force

Compared to gravity or even the electromagnetic force, the strong nuclear force acts over a range of _______ distances.

• long

• short

What is the cause of radioactivity?

• Solar contamination

• The instability of atomic nuclei

• Uranium

• Number of electrons

What does alpha particles consists of?

• 1 proton and 1 neutron

• 2 protons and 2 neutrons

• 1  proton

• 3 protons and 3 neutrons

The term used to describe when one element changes into a completely different element is known as _____.

• transmutation

• auto-correct

• cross-contamination

• gamma emission

Which type of radiation is most penetrating?

• Positron

• Beta

• Alpha

• Gamma