P1 STC Lesson 4 Half life

Has the symbol

• Alpha
• Beta 
• Gamma

Has the symbol

• Alpha

• Beta

• Gamma

Has the symbol

• Alpha
• Beta
• Gamma

The half life of Thorium-234 is 24 days. What fraction of the element remains after 96 days

• 1/2

• 1/4

• 1/8

• 1/16

The unit of Dose Equivalent is

• Joules
• Sieverts
• Grays
• Gammas

What is meant by the statement that ₁₅P³² has a half life of 14 days

• It takes 7 days to go down to 50% radioactivity each time
• It takes 14 days to go down to 50% radioactivity each time
• After 14 days it starts to become less radioactive
• It takes 14 days to go up by 50% radioactivity each time

Which isotope has a half-life of 5715 years? 

• Carbon-12
• Cobalt-60
• Carbon-14
• Cesium-137

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

Tags

NGSS.HS-PS1-8

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?

• 100.0g
• 50.0g
• 12.5g
• 8.5g

Tags

CCSS.HSF.LE.A.4

The half life of iodine-131 is 8 days. What fraction of an iodine-131 sample will remain after 40 days?

• 1/2

• 1/64

• 1/5

• 1/32