GCA PHY Nuclear Decay and Half-Life Differentiation

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
• 6.25g

After the third half-life, how much of the sample is left?

• 1/2
• 1/3
• 1/16
• 1/8

Tags

NGSS.HS-PS1-8

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

• 70 years

• 140 years

• 210 years

• 280 years

Tags

NGSS.HS-PS1-8

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

• ¹⁴₅B
• ¹⁴₆C
• ¹⁴₇N
• ⁴₂He

Tags

NGSS.HS-PS1-8

Complete the nuclear reaction

₈₅²⁰⁹At = ___ + ₂⁴He

• ₈₃²⁰⁵Bi

• ₈₇²¹³Fr

• ₈₁²⁰⁷Tl

• ₈₅²⁰⁸At

Tags

NGSS.HS-PS1-8

This is the correct equation for U-238 decay.

• true

• false

Tags

NGSS.HS-PS1-8