(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?

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)

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.

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