A 2-cm-thick piece of cardboard placed over a radiation source would be most effective in protecting against which type of radiation?
A alpha
B beta
C gamma
D x-ray
Why are enormous amounts of energy required to separate a nucleus into its component protons and neutrons even though the protons in the nucleus repel each other?
A The force of the protons repelling each other is small compared to the attraction of the neutrons to each other.
B The electrostatic forces acting between other atoms lowers the force of repulsion of the protons.
C The interactions between neutrons and electrons neutralize the repulsive forces between the protons.
D The forces holding the nucleus together are much stronger than the repulsion between the protons.
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