Radioactivity, Fission, Fusion, Carbon Dating

Radioactivity 1

100

This material can stop gamma rays.

What is lead? What is concrete?

200

Isotopes of the same element have different numbers of:

What are neutrons?

300

Symbols for:

Alpha particles

Beta particles

Gamma radiation

What is:

⁴₂He

⁰_-1e

y

400

Balance the nuclear equations:

⁵¹₂₄Cr + ⁰_-1e →_________ + γ 

²²⁶₈₈Ra → __________ + ⁴₂He

²³⁴₉₁Pa → __________ + ⁰_-1e    

What is:

⁵¹₂₄Cr + ⁰_-1e → ⁵¹₂₃V + γ 

²²⁶₈₈Ra → ²²²₈₆Rn + ⁴₂He

²³⁴₉₁Pa → ²³⁴₉₂U + ⁰_-1e 

500

What percent of a sample of a radioactive element whose half-life = 5.0 years will decay after 10 years?

What is 75%?

Radioactivity 2

100

Isotopes of the same element have the same number of:

What are protons?

200

It is the time required for the amount of something to fall to half its initial value.

What is the half-life?

300

They have a high penetrating power.

What are gamma rays?

400

Why fission releases large amount of energy.

What is the binding energy between protons and neutrons?

500

Tritium is hydrogen-3 and has a half-life of 12.3 years. Of a 48.0 mg sample, how much will remain after 9.25 years?

What is 30 mg?

Radioactivity 3

100

It’s the mass of gamma rays.

What is zero?

200

Splitting a large nucleus into smaller nuclei.

What is fission?

300

Composition of

Alpha particles

Beta particles

Gamma radiation

What is:

protons, neutrons

electron

electromagnetic wave

400

Why are control rods used in nuclear reactors.

What is to slow do the neutrons to control the reaction?

500

A fossil of an unknown age is found.  Scientists determine that the C-14/C-12 ratio in the fossil is 1/32 of the ratio found in living substances today. Calculate the age of the fossil. C-14 has a half life of 5730 years.

What is 28,650 years?

Radioactivity 4

100

One way to know the date of death of an organic life.

What is carbon (14) dating?

200

Combining two nuclei into one.

What is fusion?

300

Mass of:

Alpha particles

Beta particles

Gamma radiation

What is:

4 amu

0 amu

0 amu

400

Tritium (H-3) is a radioactive isotope of hydrogen with a half-life of 12.3 years.  How long would it take for a 40.0 g sample to decay down to 5 g?

What is 36.9 years?

500

An archaeologist discovers a wooden mask whose C-14/C-12 ratio is one-sixty fourth the ratio measured in a newly fallen tree.  How old is the wooden mask?

What is 34,380 years old?

Radioactivity 5

100

This metal is known to stop beta particles.

What is aluminium?

200

This element can determine the age of an object.

What is carbon 14?

300

This radioactivity particle has a negative charge.

What is beta radioactivity?

400

After 25.0 days, a 120 kg sample of Bi-210 decays down to just 7.5 kg. What is its half-life?

What is 6.25 days?

500

What length of half life for an isotope would be best for medical imaging.  

What is a few days?