IPC unit 5 lesson 7

If you have 200 grams of a radioactive substance, how many grams of the radioactive substance will you have after one half-life?

100g

If you have 600 atoms of a radioactive substance, how many atoms will remain after two half-lives?

150

If you have 600 atoms of a radioactive substance, how many atoms will remain after one half-life?

300

___ is a form of electromagnetic energy.

A photon

___ is a substance that has a charge of +1 and a mass close to zero.

A positron

emits electromagnetic radiation - emits a particle with a mass number of 4 and a 2+ charge - emits an electron particle with a negative charge - emits a positron or an electron with a positive charge - can be stopped by a sheet of paper - can be stopped by lead - can be stopped by wood or aluminum

Alpha Alpha Beta Gamma Gamma Alpha Beta

Who discovered radioactivity in uranium?

Henry Becquerel

Check all sources of natural background radiation.

Plants Rocks Cosmic rays Sun

"___" describe(s) an element that emits nuclear radiation.

Radioactivity

What did the drawer experiment prove?

The mineral itself gave off energy without sunlight.

What happened when Henry Becquerel repeated his experiment by wrapping a mineral in photographic paper and placing it in a drawer?

a picture of the mineral formed on the photographic paper

Beneficial uses of radiation include ___.

all of these

High-energy photons that are emitted during nuclear fission reactions and radioactive decay are called ___.

gamma rays

In which location will a person receive larger amounts of natural background radiation?

rocky high-altitude area

In order for an atom to emit radiation, it must have a(n) ___ nucleus.

unstable