Describe what happens to the position of electrons when they absorb electromagnetic radiation.
How are positive ions formed?
What is an isotope?
Define repeatable.
Convert 400g to the correct unit.
Challenge: A firework appears to give off light because...
What can make a nucleus unstable?
What does an unstable nucleus do in order to become more stable?
What is radioactive decay?
What is activity?
What are the units for activity?
What is the “count-rate”?
What is the most commonly used radioactivity detector called?
What can make a nucleus unstable?
What does an unstable nucleus do in order to become more stable?
What is radioactive decay?
What is activity?
What are the units for activity?
What is the “count-rate”?
What is the most commonly used radioactivity detector called?
What does an unstable nucleus do to become more stable?
What is radioactive decay?
What is the “count-rate”?
What is “activity”?
What are the units for activity?
Plutonium-239 is an isotope of plutonium.
In a sample of Plutonium-239there are 5.11x1023 atoms. Over 2 minutes 1.35x1023 Plutonium-239nuclei have decayed.
Explain why the nuclei have decayed.
Carbon-14 is an isotope of carbon.
In a sample of carbon-14there are 9.78 x1023 atoms. Over 10 minutes 2.32x1023 carbon-14nuclei have decayed.
Explain why the nuclei have decayed.
Describe what radioactive decay is and .explain why it is said to be random and unpredictable.
What is radioactive decay described as unpredictable?
Define radioactive decay.
State the units for activity.
What is the count rate?
What types of nuclei give out radiation?