WorksheetsRadioactivity and Half-Life
Total questions: 25
Worksheet time: 25mins
What is a half-life?
the time required for one half of the radioactive atoms in a sample to decay
the time required for one third of the radioactive atoms in a sample to decay
What is a Geiger counter?
an instrument that uses sonar to bounce sound waves off the ocean bottom
an instrument that measures vibrations in the ground
an instrument that detects the particles emitted or given off by decaying atoms
When the radioactive atoms in a sample decay by half...
alpha decay
Beta decay
half-life
Uranium238 take _________________for one half-life.
5730 years
20 billion
1.65 million
4.5 billion
The time it takes for 50% of the nuclei in a radioactive sample to decay to its stable isotope is called _____
the daughter product
geologic time
the half-life
the half-time
Half-life
A measurement of the total number of protons and neutrons in an element
atoms of the same element with different numbers of neutrons
The spontaneous release of material from the nucleus of radioactive isotopes
The time it takes for 1/2 of an original radioactive atom to decay
How long is one half life of C-14
5730
11460
17190
28650
After 2 half lives, what percent is the parent isotope?
100%
50%
75%
25%
After 4 half-lives, 1g of a sample of Krypton-85 remains unchanged. What was the original mass of the sample?
16g
32g
0.0625g
4g
If one has 12 kg of Polonium and it undergoes two half-lives, how much do you have left?
12 kg
3 kg
6 kg
After every half-life, a radioactive atom is
reduced by 50%
decreased by 1/4
increased by 1/2
Daughter atom
the original, unstable radioactive element
stable atom that results from the decay of a radioactive atom
The time it takes for one half of the radioactive atoms in a sample to decay
parent atom
the original, unstable radioactive element
the time it takes for one half of the radioactive atoms in a sample to decay
a subatomic particle that has no charge and is located in the nucleus
What is decay?
a subatomic particle that has no charge located in the nucleus of an atom
a stable atom that results from a radioactive atom
a process in which a radioactive atom releases particles and energy
What is an isotope?
one of several forms of the same atoms; same number of protons but have different number of neutrons
a particle that has no charge and is located in the nucleus of an atom.
energy in the form of waves or particles that is emitted from an object and travels through space or air
What is radiometric dating used for ?
to tell absolute age of a rock or fossil
to tell the relative age of a rock or fossil
a way to tell the age of materials based on measuring radioactive atoms and daughter atoms
This man was poisoned by
half-life
radiation
daughter atoms
Geiger Counter
Does the rate of radioactive decay stay at a constant rate?
no
yes
When is the rate of radioactive decay the fastest?
end
beginning
middle
Marie Curie discovered
Thorium
Polonium
uranium
If the half life of a radioactive element is 100yrs, how long would it take for the radioactivity to reduce by one half?
200yrs
100yrs
50yrs
300yrs
What is the primary factor that determines the half-life of a radioactive isotope?
The temperature of the environment
The initial amount of the isotope
The type of radiation emitted
The stability of the isotope's nucleus
If a sample of Carbon-14 has a half-life of 5730 years, how much of a 100g sample would remain after 11,460 years?
25g
50g
12.5g
6.25g
Which of the following best describes the process of radioactive decay?
The splitting of an atom into smaller parts
The emission of particles and energy from an unstable nucleus
The combination of two nuclei to form a heavier nucleus
The absorption of energy by a stable nucleus
In a laboratory experiment, a scientist measures the half-life of a radioactive substance to be 8 hours. If the scientist starts with a 160g sample, how much will remain after 24 hours?
80g
40g
20g
10g
