Nuclear Decay and Half-Life

In a nuclear reaction, the parent isotope is

• an alpha or beta particle

• the stable decay product

• the same as the daughter isotope

• the radioactive (or unstable) isotope.

Tags

NGSS.HS-PS1-8

As a sample of a radioactive element decays, its half-life

• decreases

• increases

• stays the same

• doubles

Tags

NGSS.HS-PS1-8

As a the temperature of a radioactive element increases, its half-life will

• decreases

• increases

• stays the same

• doubles

Tags

NGSS.HS-PS1-8

A radioactive element has a half-life of 2 days. What fraction of the parent isotope is left after 6 days?

• 1/2

• 1/4

• 1/8

• 1/3

Tags

NGSS.HS-PS1-8

Identify the half life of the substance shown in the graph.

• 4 days

• 8 days

• 12 days

• 16 days

Tags

NGSS.HS-PS1-8

How long is one half life of C-14

• 5730

• 11460

• 17190

• 28650

What is the half-life of the radioactive substance?

• 50%

• 25%

• 5 years

• 10 years

Tags

NGSS.HS-PS1-8

After 2 half lives, what percent is the parent isotope?

• 100%

• 50%

• 75%

• 25%

Tags

NGSS.HS-PS1-8

After 200 million years 1/16 of a radioactive waste remains.  How many million years is the half life of this substance?

Mathematical Equivalence

ON

Which of the following best describes a half-life?

• the mass of a radioactive isotope left after half of a second

• a process dependent on temperature and pressure

• the time it takes for half the mass of a radioactive sample to decay

• a type of chemical reaction

Tags

NGSS.HS-PS1-8