modern physics topics

Which type of fundamental force overcomes the repulsive, electrostatic force between protons in the nucleus of an atom?

• the gravitational force

• the weak force

• the strong force

• the magnetic force

Which fundamental force is primarily responsible for the attraction between protons and electrons?

• strong

• gravitational

• electromagnetic

• weak

The splitting of a nucleus into smaller nuclei is

• fusion
• fission
• decay
• gamma radiation

How many protons does Uranium have?

• 92

• 238

• 146

• it can change

In order of most to least penetrating radiation we have

• Alpha , Beta,  Gamma
• Beta , Gamma , Alpha
• Gamma, Beta, Alpha
• Gamma, Alpha, Beta

A helium nucleus with two protons and two neutrons is called a(n) ____.  

• alpha particle
• electroscope
• beta particle
• gamma ray

Solve this equation for alpha decay.
₈₅²⁰⁹At = ___ + ₂⁴He

• ₈₃²⁰⁵Bi
• ₈₆²⁰⁹Rn
• ₈₁²⁰⁷Tl
• ₈₅²⁰⁸At

Gamma rays have

• no mass

• a huge mass

• a small mass

• an average mass

What occurs in both fusion and fission reactions?

• Small amounts of energy are converted into large amounts of matter.

• Small amounts of matter are converted into large amounts of energy.

• Heavy nuclei are split into lighter nuclei.

• Light nuclei are combined into heavier nuclei.

Time necessary for 50% of a radioactive sample to decay.

• carbon dating

• half-life

• alpha particle

• gamma ray