Half Life

Half Life

Multiple Choice

How many seconds did it take for half the Radium atoms to decay?

• 20 seconds

• 40 seconds

• 80 seconds

• 120 seconds

Multiple Choice

How many seconds in total will it take for only 1 Radium atom to be left?

• 170

• 180

• 190

• 200

Multiple Choice

If the half life Uranium-238 is 3 days, how long would it take for 40 g of Uranium to decay into 10 g?

• 3 days

• 6 days

• 9 days

• 12 days

Multiple Choice

How many half lives has a 12 g sample of Plutonium-238 been through if there is only 1.5 g left?

• 1

• 2

• 3

• 4

Multiple Choice

The half-life of protactinium-226 is 2 minutes. If you started with 20 grams of Pa-226, how much do you have after 8 minutes?

• 10

• 5

• 2.5

• 1.25