AQA GCSE Physics Half-life radioactivity

What is the Half Life of this isotope?

(a)  

• 3 days
• 5 days
• 8 days
• 10 days

The Half Life of Californium 252 is 5 years.

(a)  

• TRUE
• FALSE

The time it takes for a radioactivity level to drop by a half is is the sample's (a)   .

• half life
• quarter life
• whole life
• wonderful life

If the half life of a radioactive element is 100 years, how long would it take for the radioactivity to reduce by one half?

(a)  

• 100yrs
• 200yrs
• 50yrs
• 300yrs

(a)   is the process by which unstable atoms emit radiation until they become stable.

• Radiation
• Chemical Reaction
• Radioactive Decay
• Isotopes

A certain radioactive sample has a half life of 2 years. After 6 years, what fraction of the sample is left?

(a)  

• 1/8
• 1/2
• 1/3
• 1/16

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 you had 100.0 g at the beginning, how many grams would be left after 2.4 minutes has elapsed?

• 100.0g

• 50.0g

• 12.5g

• 8.5g

The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, what fraction would be left after 9.6 minutes?

• 1/2

• 1/3

• 1/16

• 1/8

The half-life of iodine-131 is 8 days.

If 10 mg of iodine-131 is given to a patient, how much is left after 16 days?

• 1.25 mg

• 2.5 mg

• 5 mg

• 10 mg