Nuclear Physics

Which of the following statements is TRUE about the decay above?

• It is alpha decay and X is a helium nucleus

• It is alpha decay and X is an electron

• It is beta decay and X is a helium nucleus

• It is beta decay and X is an electron

Tags

NGSS.HS-PS1-8

Radioisotope Uranium-238 decays to Thorium-234 as shown in the equation above. What is X?

• Proton

• Neutron

• Alpha particle

• Beta particle

Tags

NGSS.HS-PS1-8

Based on the graph, what is the half life of the sample?

• 1.0 hour

• 0.5 hour

• 2.0 hours

• 1.5 hours

Tags

NGSS.HS-PS1-8

A radioactive substance has a half-life of 8 days. What is the number of days for the substance to become 25% of the initial value?

• 8 days

• 12 days

• 16 days

• 24 days

The half-life of Radon-222 is 4 days. If the initial mass of radon is 20g, what is the mass decayed after 12 days?

• 2.5g

• 17.5 g

• 15.0g

• 5.0g

Tags

NGSS.HS-PS1-8

Which statement is NOT true about the nuclear reactor?

• The moderator is used to speed up the neutrons

• Uranium core acts as source of energy

• The control rod is used to absorb the excess neutrons

• Water acts as coolant to remove the heat produced from the reactor

Tags

NGSS.HS-PS1-8

In a series of reactions, two deuterons combine to form a helium nucleus. What is the name of this process?

• Chain reaction

• Nuclear reaction

• Nuclear fission

• Nuclear fusion

Tags

NGSS.HS-PS1-8