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Vocabulary
Half-Life
Half-Life
Past Topics
Miscellaneous
100
Alpha particles, beta particles and/or gamma rays are given off when this type of reaction occurs.
What is Radioactive Decay
100

A radioactive substance has a half-life of 20 years. If you start with 100 grams, how much will remain after 40 years?

What is 25 grams

100
This amount of a substance remains after 2 half lives:
What is 1/4
100

This ethics principle ensure participants understand the nature and purpose of the experiment, including potential risks (both physical and psychological), before agreeing to participate in the study. 

What is informed consent

100
This the name of certian elements with the same number of protons but different number of neutrons
What are isotopes
200

This type of decay causes moderate damage but must be within the body to cause damage

What is Beta decay

200

A scientist observes that a 200-gram sample of a radioactive material decays to 50 grams in 60 years. What is the half-life of this material?

What is 30 years

200
This amount of a substance decays after 3 half-lives
What is 7/8
200

Using this way of thinking about right and wrong helps guide our actions, decision-making and the stances we take on matters

What is a ethics

200
(True or false) All nuclear reactions change the identity of an element
What is false (gamma rays do not)
300
This type of nuclear radiation is the most penetrating
What is a gamma ray
300

If a substance has a half-life of 5 years, what percentage of the original substance will remain after 15 years?

What is 12.5%

300
I-131 is used to treat thyroid cancer. If you ingest a 20 mg sample of I-131, this amount of days will it take until there is only 2.5 mg of I-131 left in your body? (half-life of I-131 = 8 days)
What is 24
300

Using this type of bias we tend to use evidence that supports our preconceived beliefs about an issue

What is confirmation bias

300
Three objects can stop gamma rays. Name two.
What are lead and concrete (and water)
400
This type of decay particle is a helium nucleus
What is an alpha particle
400

Carbon-14 has a half-life of approximately 5,730 years. If a fossil has only 25% of its original Carbon-14 left, how old is the fossil?

What is 11,460 years

400

You have a sample that now contains 40 g of Actinium-227. How many grams of Actinium-227 must have been in the sample 44 years ago (Half-life of Actinium is 22 years)?

What is 160

400

Using this type of bias a researcher unconsciously affects results, data, or a participant in an experiment

What is Experimenter bias

400
This is the reason that certian unstable radioisotopes give of alpha, beta and gamma rays
What is to become stable
500
What is the term that means “the time it takes for half of the radioactive atoms in a sample to decay.”
What is a half life
500

After 10 years, 25 grams of a substance remain from an initial amount. If the substance has a half-life of 5 years, what was the original amount?

What is 100 grams

500

The half-life of radium-226 is 1599 years. How much is left after 4797 years if you have a 250 grams sample right now?

What is 31.25g

500

The aim of this approach is to maximise positive outcomes while minimising negative effects

What is consequence based approach

500

When the balance of protons and neutrons is unstable in the nucleus an atom, the isotope may decay (break down) to form a more stable product

What is radioisotope