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? (a)  

How many grams are left after 2 half-lives? ​ (b)  

• 100 grams

• 12.5 grams
• 50 grams
• 25 grams

Tags

NGSS.HS-PS1-8

After the third half-life, what fraction of the sample is left?

• 1/2

• 1/3

• 1/16

• 1/8

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

• quarter life

• whole life

• wonderful life

• half life

Tags

NGSS.HS-PS1-8

If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?

• 1 half-life

• 2 half-lives

• 3 half-lives

• 4 half-lives

Tags

NGSS.HS-PS1-8

This is the correct equation for U-238 decay.

• true

• false

Tags

NGSS.HS-PS1-8

Balance the following equation:
¹⁴₆C --> ⁰_-1e + ________

• ¹⁴₅B
• ¹⁴₆C
• ¹⁴₇N
• ⁴₂He

Tags

NGSS.HS-PS1-8

Which type of nuclear radiation is being emitted here?

• Alpha
• beta
• gamma 
• none

Tags

NGSS.HS-PS1-8

• ²³⁶₉₂U
• ²³⁶₉₃U
• ²³⁴₉₂Np
• ²³⁴₉₃Np

Tags

NGSS.HS-PS1-8

Match the following

• Beta

• 
• Positron

• 
• Neutron

• 
• Gamma

• 
• Alpha

• 

Tags

NGSS.HS-PS1-8

NGSS.HS-PS4-3

Match the following Nuclear numbers to the correct particle that might result in a nuclear equation:

• Alpha particle

• 
• Gamma ray

• 
• Beta particle

• 
• Proton or Hydrogen nucleus

• 
• Positron

• 

Tags

NGSS.HS-PS1-8