radioactivitty plenary multichoice questions.pptm Download this file
Sunday, February 26, 2012
7.14
________________________________________
7.14 starter 01 February 2012 13:08 Tell the person next to you…
· What is the most dangerous type of radiation outside the body? Why?
· What is the most dangerous type of radiation inside the body? Why?
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> Answers
· Gamma radiation is the most dangerous type of radiation outside the body because it is extremely penetrating. (Alpha radiation is not dangerous because it is stopped by skin)
· Alpha radiation is the most dangerous type of radiation inside the body because it is highly ionising due to its high charge (+2) and high mass (RAM=4). (Gamma radiation is only very weakly ionising) 7.14 12 January 2012 10:24
· 7.14 describe the dangers of ionising radiations, including:
· radiation can cause mutations in living organisms
· radiation can damage cells and tissue
· the problems arising in the disposal of radioactive waste
> Chernobyl Disaster Hiroshima and Nagasaki - the first nuclear bombs After the Hiroshima bomb
7.14 starter 01 February 2012 13:08 Tell the person next to you…
· What is the most dangerous type of radiation outside the body? Why?
· What is the most dangerous type of radiation inside the body? Why?
>
> Answers
· Gamma radiation is the most dangerous type of radiation outside the body because it is extremely penetrating. (Alpha radiation is not dangerous because it is stopped by skin)
· Alpha radiation is the most dangerous type of radiation inside the body because it is highly ionising due to its high charge (+2) and high mass (RAM=4). (Gamma radiation is only very weakly ionising) 7.14 12 January 2012 10:24
· 7.14 describe the dangers of ionising radiations, including:
· radiation can cause mutations in living organisms
· radiation can damage cells and tissue
· the problems arising in the disposal of radioactive waste
> Chernobyl Disaster Hiroshima and Nagasaki - the first nuclear bombs After the Hiroshima bomb
7.13
________________________________________
7.13 12 January 2012 10:24
· 7.13 describe the uses of radioactivity in medical and non-medical tracers, in radiotherapy and in the radioactive dating of archaeological specimens and rocks
> Medical Tracers Radioactive Dating
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> 
7.13 12 January 2012 10:24
· 7.13 describe the uses of radioactivity in medical and non-medical tracers, in radiotherapy and in the radioactive dating of archaeological specimens and rocks
> Medical Tracers Radioactive Dating
>
>
Saturday, February 25, 2012
7.9
________________________________________
From: Matt Baker
Sent: Monday, February 20, 2012 8:52 AM
To: Amaris Odermatt; Antti Markkanen; Aufar Alif Waldi; Charlotte Cowley; Churaimas Diskul; Dillon Riberio; Eliza Mae De Vries; Hannah Amanda Fotheringham; Harriet Beattie; James Arias; Jesper Kwant; Khuntup Issara; Kirk Leekasem; Napas Jira; Nuntikorn Kuvanant; Pankhuri Singh; Rajdamrong Diskul; Samir Apaya; Sanhacha Chitvaranund; Savannah Eve Gough; Siraket Wongchindawest
Cc: maddog11physics@posterous.com
Subject: 7.9
· 7.9 recall the sources of background radiation
> Whys Guy
· http://youtu.be/CUqdLwIITWM
7.8
________________________________________
From: Matt Baker
Sent: Monday, February 20, 2012 8:52 AM
To: Amaris Odermatt; Antti Markkanen; Aufar Alif Waldi; Charlotte Cowley; Churaimas Diskul; Dillon Riberio; Eliza Mae De Vries; Hannah Amanda Fotheringham; Harriet Beattie; James Arias; Jesper Kwant; Khuntup Issara; Kirk Leekasem; Napas Jira; Nuntikorn Kuvanant; Pankhuri Singh; Rajdamrong Diskul; Samir Apaya; Sanhacha Chitvaranund; Savannah Eve Gough; Siraket Wongchindawest
Subject: 7.8
· 7.8 understand that ionising radiations can be detected using a photographic film or a Geiger-Muller detector
>
7.4 and 7.5
________________________________________
From: Matt Baker
Sent: Monday, February 20, 2012 8:52 AM
To: Amaris Odermatt; Antti Markkanen; Aufar Alif Waldi; Charlotte Cowley; Churaimas Diskul; Dillon Riberio; Eliza Mae De Vries; Hannah Amanda Fotheringham; Harriet Beattie; James Arias; Jesper Kwant; Khuntup Issara; Kirk Leekasem; Napas Jira; Nuntikorn Kuvanant; Pankhuri Singh; Rajdamrong Diskul; Samir Apaya; Sanhacha Chitvaranund; Savannah Eve Gough; Siraket Wongchindawest
Cc: maddog11physics@posterous.com
Subject: 7.4 and 7.5 7.4 and 7.5 starter 01 February 2012 10:00 Tell the person next to you…
· What are the 7 parts of the electromagnetic spectrum you learnt in P3, Waves?
· What are they in order of increasing frequency? > (Note that microwaves are missing from this animation!) Answers
· Radio waves
· Microwaves
· Infra Red
· Visible
· Ultra violet
· X-Rays
· Gamma Rays 7.4 and 7.5 12 January 2012 10:24
· 7.4 understand that alpha and beta particles and gamma rays are ionising radiations emitted from unstable nuclei in a random process
· 7.5 describe the nature of alpha and beta particles and gamma rays and recall that they may be distinguished in terms of penetrating power Producing Alpha, Beta and Gamma radiation
· http://youtu.be/pHUgL_RS9ng
> >
Penetrating Power
· http://www.youtube.com/watch?v=48JQaZHuFsQ&feature=youtu.be
· http://youtu.be/61y2GTr0MlQ
> >
> >
Ionisation
> > > Effect of magnetic and electric fields
>
>
From: Matt Baker
Sent: Monday, February 20, 2012 8:52 AM
To: Amaris Odermatt; Antti Markkanen; Aufar Alif Waldi; Charlotte Cowley; Churaimas Diskul; Dillon Riberio; Eliza Mae De Vries; Hannah Amanda Fotheringham; Harriet Beattie; James Arias; Jesper Kwant; Khuntup Issara; Kirk Leekasem; Napas Jira; Nuntikorn Kuvanant; Pankhuri Singh; Rajdamrong Diskul; Samir Apaya; Sanhacha Chitvaranund; Savannah Eve Gough; Siraket Wongchindawest
Cc: maddog11physics@posterous.com
Subject: 7.4 and 7.5 7.4 and 7.5 starter 01 February 2012 10:00 Tell the person next to you…
· What are the 7 parts of the electromagnetic spectrum you learnt in P3, Waves?
· What are they in order of increasing frequency? > (Note that microwaves are missing from this animation!) Answers
· Radio waves
· Microwaves
· Infra Red
· Visible
· Ultra violet
· X-Rays
· Gamma Rays 7.4 and 7.5 12 January 2012 10:24
· 7.4 understand that alpha and beta particles and gamma rays are ionising radiations emitted from unstable nuclei in a random process
· 7.5 describe the nature of alpha and beta particles and gamma rays and recall that they may be distinguished in terms of penetrating power Producing Alpha, Beta and Gamma radiation
· http://youtu.be/pHUgL_RS9ng
> >
Penetrating Power
· http://www.youtube.com/watch?v=48JQaZHuFsQ&feature=youtu.be
· http://youtu.be/61y2GTr0MlQ
> >
> >
Ionisation
> > > Effect of magnetic and electric fields
>
>
7.10 to 7.12
________________________________________ 7.10 to 7.12 starter 02 February 2012 10:30
· Smoke detectors use 241Am to emit alpha particles which pass through a small air gap before being detected. If smoke particles are present they interrupt the beam of alpha particles and this triggers the alarm to go off
· Tomorrow, will the 241Am still be as radioactive?
· Next year, will the 241Am still be as radioactive?
· In a thousand years, will the 241Am still be as radioactive? Answers
· To answer the questions, we need to know the half life of Americium-241 which is 432 years
· Tomorrow and even next year its activity will hardly have changed at all (sensible for a smoke detector - you don't want it to suddenly stop working!)
· In a thousand years its activity will have dropped to about a quarter 7.10 to 7.12 12 January 2012 10:24
· 7.10 understand that the activity of a radioactive source decreases over a period of time and is measured in becquerels
· 7.11 recall the term ‘half-life’ and understand that it is different for different radioactive isotopes
· 7.12 use the concept of half-life to carry out simple calculations on activity Half-life of Different Isotopes
· http://youtu.be/S-goxH05LbY
>
>
> 7.10 to 7.12 questions 01 February 2012 09:46
1. What happens to the amount of ‘mother’ nuclei as time passes?
2. What sort of radioisotope will decay the fastest - one with a long half life or one with a short half life?
3. Does half life tell us exactly when a particular nucleus in a radioisotope will decay?
4. What are the two definitions of half life?
5. What does the activity of a source mean?
6. What is the unit of activity?
7. What will happen to the number of ‘mother’ nuclei after two half lives?
8. What will happen to the activity of a source after two half lives? 7.10 to 7.12 calculation questions 12 January 2012 10:24
1. A radioisotope has a half life of 12 years. What fraction of the radioisotope will be left after 60 years?
2. If the activity of a sample falls to 1/64th of its original level after 2 hours, what is the half life of the sample?
3. The background radiation in a laboratory is 7 Bq. The count rate from a radioisotope is measured and it has a reading of 119 Bq. If the half life of the radioisotope is 10 minutes, what will be the reading 20 minutes later?
4. Potassium decays into argon. The half life of potassium is 1.3 billion years. A sample of rock from Mars is found to contain three argon atoms for every atom of potassium. How old is the rock?
· Smoke detectors use 241Am to emit alpha particles which pass through a small air gap before being detected. If smoke particles are present they interrupt the beam of alpha particles and this triggers the alarm to go off
· Tomorrow, will the 241Am still be as radioactive?
· Next year, will the 241Am still be as radioactive?
· In a thousand years, will the 241Am still be as radioactive? Answers
· To answer the questions, we need to know the half life of Americium-241 which is 432 years
· Tomorrow and even next year its activity will hardly have changed at all (sensible for a smoke detector - you don't want it to suddenly stop working!)
· In a thousand years its activity will have dropped to about a quarter 7.10 to 7.12 12 January 2012 10:24
· 7.10 understand that the activity of a radioactive source decreases over a period of time and is measured in becquerels
· 7.11 recall the term ‘half-life’ and understand that it is different for different radioactive isotopes
· 7.12 use the concept of half-life to carry out simple calculations on activity Half-life of Different Isotopes
· http://youtu.be/S-goxH05LbY
>
>
> 7.10 to 7.12 questions 01 February 2012 09:46
1. What happens to the amount of ‘mother’ nuclei as time passes?
2. What sort of radioisotope will decay the fastest - one with a long half life or one with a short half life?
3. Does half life tell us exactly when a particular nucleus in a radioisotope will decay?
4. What are the two definitions of half life?
5. What does the activity of a source mean?
6. What is the unit of activity?
7. What will happen to the number of ‘mother’ nuclei after two half lives?
8. What will happen to the activity of a source after two half lives? 7.10 to 7.12 calculation questions 12 January 2012 10:24
1. A radioisotope has a half life of 12 years. What fraction of the radioisotope will be left after 60 years?
2. If the activity of a sample falls to 1/64th of its original level after 2 hours, what is the half life of the sample?
3. The background radiation in a laboratory is 7 Bq. The count rate from a radioisotope is measured and it has a reading of 119 Bq. If the half life of the radioisotope is 10 minutes, what will be the reading 20 minutes later?
4. Potassium decays into argon. The half life of potassium is 1.3 billion years. A sample of rock from Mars is found to contain three argon atoms for every atom of potassium. How old is the rock?
7.6 and 7.7
________________________________________ 7.6 and 7.7 12 January 2012 10:24
· 7.6 describe the effects on the atomic and mass numbers of a nucleus of the emission of each of the three main types of radiation
· 7.7 understand how to complete balanced nuclear equations
>
> Did you spot the deliberate mistake on this animation?
> Answer The symbol for Neptunium is Np not NP!
[cid:image001.png@01CCF2D2.55993660] 7.6 and 7.7 Plenary 12 January 2012 10:24
>
> 
· 7.6 describe the effects on the atomic and mass numbers of a nucleus of the emission of each of the three main types of radiation
· 7.7 understand how to complete balanced nuclear equations
>
> Did you spot the deliberate mistake on this animation?
> Answer The symbol for Neptunium is Np not NP!
[cid:image001.png@01CCF2D2.55993660] 7.6 and 7.7 Plenary 12 January 2012 10:24
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>
Friday, February 24, 2012
7.2
________________________________________ 7.2 starter 31 January 2012 11:35 Tell the person next to you…
· The names of 3 subatomic particles
· What properties do they have?
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> 7.2 11 January 2012 14:49
· 7.2 describe the structure of an atom in terms of protons, neutrons and electrons and use symbols such as 146C to describe particular nuclei
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>
· The names of 3 subatomic particles
· What properties do they have?
>
> 7.2 11 January 2012 14:49
· 7.2 describe the structure of an atom in terms of protons, neutrons and electrons and use symbols such as 146C to describe particular nuclei
>
>
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