Half Life

Multiple Choice

The three types of nuclear radiation in order of decreasing penetrating power are

• alpha, beta, gamma

• alpha, gamma, beta

• beta, alpha, gamma

• gamma, alpha, beta

Multiple Choice

What makes something radioactive?

• elements with an atomic number above 81
• an unstable nucleus
• contaminated sewage
• It decays over time

Multiple Choice

_______________ is the process by which unstable atoms emit radiation until they become stable.

• Radiation
• Chemical Reaction
• Radioactive Decay
• Isotopes

Multiple Choice

How many protons does this isotope of titanium have?

• 48
• 22
• 26
• 70

Multiple Choice

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

Multiple Choice

What is Half-life?

• The amount of time it takes for some of the nuclei in a sample of the isotope to decay
• The amount of time it takes for half the electrons in a sample of the isotope to decay
• The amount of time it takes for half the nuclei in a sample of the isotope to decay
• the amount of time it takes to double the nuclei in a sample of the isotope to decay

Multiple Choice

What is the half-life of iodine-131?

• 32 days
• 8 days
• 16 days
• 24 days

Multiple Choice

What is the half-life of iodine-131?

• 32 days
• 8 days
• 16 days
• 24 days

Multiple Choice

You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years. 
How many grams are left after 1 half life? 

• 100 grams
• 25 grams
• 2 grams
• 50 grams

Multiple Choice

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

• 3.0g
• 0.25mg
• 0.3g
• 0.25g