(4E4) Check in + Recap on Radioactivity

Welcome back!

Let's check in with each other before diving back into physics again.

Let's welcome Carista!!!

Draw

How are you feeling about the nationals exams/prelims currently?

Or just in general.

Circle the emotion nearest to how you are feeling now.

Before lesson starts...

• Arrive and get ready for greetings within 10 mins when bell rings

• Materials to prepare for every lesson:-

  • Your Physics notebook (bible) + Summary list

  • Writing materials + calculator

  • PLDs

  • TYS

  • Worksheets (if any)

Before lesson starts...

• You might want to get a small file to just put notes from all chapters in (not the practice worksheets) so you can refer as we revise

• We stand, greet and let’s start learning!

Flow of lesson

If there are homeworks...

• To be completed within 1 to 2 lessons (TYS questions / full papers etc.)

• Need you to be committed for the revision to work out.

Flow of lesson

Revision Format

• Go through summary list of items for that topic/s

• Quizziz / Kahoot quick concept check in

• Go through TYS questions / Practice topical revision based on other schools

  • Pay attention to answer structure and record in your bible or summary.

• Some lessons will be used for timed practice (if available)

June Holiday homework

2023 Prelims

• Mark your work based on solution sheet behind.

• Circle questions you are unsure of the answers or why you are wrong or whether you scored any marks

• Pass to me on Friday

Let's start with a recap on radioactivity

How much do you remember?

Multiple Choice

What notation is this called?

• Atomic

• Chemical symbol

• Nuclide

• Nucleus

Multiple Choice

What does A represent?

• Atomic number

• Neutron number

• Nucleon number

• Proton number

Multiple Select

What does Z represent?

• Mass number

• Electron number

• Atomic number

• Proton number

Multiple Choice

What's the difference between iodine-131 and iodine-144 ?

• They have different number of protons.

• They have different number of neutrons.

• They have different number of electrons.

• They react with other chemicals differently.

Open Ended

Why are some isotopes unstable that it needs to undergo radioactive decay?

Fill in the Blank

Nuclear decay is a ______ and ___________ process where an unstable nucleus loses energy by emitting electromagnetic radiation or particle(s).

Open Ended

What are the three types of nuclear emissions?

Multiple Select

Which nuclear emission/s could be stopped by a few millimetres thick of aluminium?

• alpha-particles

• beta-particles

• gamma radiation

Multiple Select

Which nuclear emission/s could be stopped by human skin?

• alpha-particles

• beta-particles

• gamma radiation

Multiple Select

Which nuclear emission/s could be stopped by few cm thick of lead or few metres of concrete?

• alpha-particles

• beta-particles

• gamma radiation

Multiple Select

Which nuclear emissions have the highest ionising effect?

• alpha-particles

• beta-particles

• gamma radiation

Multiple Select

Which nuclear emissions have the highest penetrating power?

• alpha-particles

• beta-particles

• gamma radiation

Multiple Choice

What is the nature of an alpha particle?

• A Helium atom

• A Helium nucleus

• A Helium Ion

Multiple Choice

What is the nature of a beta particle?

• a neutron

• a proton

• an electron

Multiple Choice

What is the nature of gamma radiation?

• an electron

• an atomic nucleus

• electromagnetic radiation

Multiple Choice

What could have the nuclear radiation be?

• alpha particle

• beta particle

• gamma rays

Multiple Select

Which of the following are examples of ionising radiation?

• UV rays

• X-rays

• gamma rays

• alpha particle

• beta particle

Multiple Select

Which of the following are examples of background radiation?

• UV rays

• X-rays

• gamma rays

• alpha particle

• beta particle

Open Ended

What is the S.I. unit for radioactivity? (just the symbol)

Fill in the Blank

One becquerel (1 Bq) is equal to one___________ per second.

S.I. Unit and measurement

• Ionising nuclear radiation can be measured using a Geiger-Muller (GM counter).

• The SI unit for the amount of radioactivity is the Becquerel (   Bq     ).

• One becquerel (1 Bq) is equal to one disintegration per second.

  • The measurement of radiation is sometimes expressed as being a rate of counts per unit time, also known as the count rate.

Fill in the Blank

The half-life of a radioactive nuclide is the time taken for ____ the nuclei of that nuclide in any sample to decay.

Multiple Choice

Are half-life of radioactive isotopes fixed?

• Yes

• No

Multiple Choice

Given the graph of the decay of a radioactive isotope, what's the approximate half-life of the radioactive isotope if the graph has accounted for background radiation?

• 1 min

• 2 min

• 3 min

• 4 min