Friday 23 November 2012

12a work Friday 23rd November

Hello Y12, sorry I was not there for our lesson today - I will be back P4 for 12b.
12a work is as follows;
1. Research emission and absorption spectra for elements. Make notes on what they are and what they show - this is a tricky idea but it relates to the absorption and emission of photos of particular colours between energy levels of atoms as we showed in the models we did in class with Starburst. Bring you notes and diagrams to the lesson next Friday for us to discuss
2. What is the photoelectric effect what was observed and how did Einstein explain it with photons? Another tricky but key idea for us to discuss on Friday - can you come up with a model to explain what is going on?

3. What are the energy levels in a hydrogen atom, and why is n=1 labelled as negative?

Thanks, Ms Hamnett

Monday 19 November 2012

Stargazing Oxfordshire – astronomy evening

Stargazing Oxfordshire – astronomy evening

Find out more about research in astrophysics from professional scientists, and observe the night sky with your local community astronomers.

Tuesday 20^th November 2012 – entrance from 6.00pm

More information and booking can be found here: http://www2.physics.ox.ac.uk/events/2012/11/20/stargazing-oxfordshire. We will be running similar events in January and March.

Thursday 8 November 2012

Particle physics tips

KNOW YOUR FORMULA SHEET
Hadrons feel the strong nuclear force and are made of quarks
Baryons are made of three quarks, mesons are made of two quarks (a quark and antiquark)
Protons are uud, neutrons are udd
Baryons eventually decay into protons (protons are the only stable baryon)
Neutrons decay into a proton, an electron and an antineutrino (beta minus decay)
Protons decay into a neutron, a positron and an neutrino (beta plus decay)
Hadron – heavy and strong Lepton – light and weak
Leptons have a lepton number of 1 (or minus 1 for antiparticles) and lepton number is conserved
Leptons can change into other leptons during decay via the weak interaction
Strangeness is conserved in a strong interaction
K mesons are strange particles (containing a strange or antistrange quark) formed through the strong interaction and decay through the weak interaction into π mesons, muons and antineutrinos
π mesons Charged π mesons decay into muons and antineutrinos (or antimuons and neutrinos), π zero pions decay into photons
Muons decay into electrons and antineutrinos (or antiparticles)

Friday 26 October 2012

Particles progress test on Friday 7th November

This is for both y12 groups, there will be an electricity question too. half ter homework is to revise and complete kerboodle work
Thanks and happy half term!

Wednesday 24 October 2012

website link

http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

Friday 12 October 2012

Particle accelerators talk

The next free lectures at the Department of Physics are detailed below, all free, click on the links to find out more and to book a space.

The Hintze Lecture Series - ‘LSST: New Science Frontiers’

Date: 26 Oct 2012 - 5:00pm - 6:00pm

Venue: Martin Wood Complex, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU

Audience: General public (Age 14+)

Expected to be on the sky by 2020, the Large Synoptic Survey Telescope system will produce a 6-band (0.3-1.1 micron) wide-field deep astronomical survey of over 18,000 deg2 of the southern sky using an 8.4 meter ground-based telescope and a 3200 megapixel camera. Each night, LSST will obtain multiple images covering a wide swath of sky visible from its location on Cerro Pachón in northern Chile. Each patch of visible sky will be visited more than 800 times during the 10-year survey. The LSST leverages innovative technology in all subsystems.

Particle accelerators: making the Higgs Boson and more!

Free

Date: 6 Nov 2012 - 6:00pm - 7:00pm

Venue: Martin Wood Complex, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU

Audience: General public (Age 14+)

The Large Hadron Collider (LHC) at CERN is the world's highest-energy sub-atomic particle smasher. In July 2012 physicists working at the LHC announced convincing evidence for discovery of a new type of particle that is very likely a Higgs Boson.

Telescope trip and Kerboodle log in

Reminder about the Telescope visit Wednesday 24th October at Dept of Physics, 7pm-9pm, free!
Letters to go out next week

Kerboodle logins for Y12

www.kerboodle.com

Username - initial and surname, no hyphens

E.g. Jack Smith would be jsmith

Password – first name, if shorter than 6 letters then add letters of surname to make 6

E.g. jacksm

Organisation code 5166

Monday 1 October 2012

Exoplanets talk Monday 8th October

The talk below is free, click on the link for more info and to book places if you are interested

Portraits of distant worlds

Date:

8 Oct 2012 - 6:00pm - 7:00pm

Venue:

Martin Wood Complex, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU

Audience:

General public (Age 14+)

http://www2.physics.ox.ac.uk/events/2012/10/08/portraits-of-distant-worlds

Portraits of distant worlds

Dr Suzanne Aigrain

Less than twenty years ago, the Solar System was the only planetary system we knew about. Since then, astronomers have discovered many hundreds of exoplanets - planets which orbit other stars than the Sun. We now know that exoplanets are common, perhaps even outnumbering the stars in our Galaxy. Some of them are so utterly unlike any of the Solar System planets that they challenge both our imagination, and our theories of how planets form and evolve.

In this talk, I will describe some of the highlights and challenges of exoplanet exploration in the past decade, and outline how we are working to detect and characterise an ever wider range of planets, including some which might harbour life.

Friday 21 September 2012

Y12 Homework

In Physics A-level we will be using unit prefixes for very small and very large numbers. Find the names, sizes and symbols of powers of 10 unit prefixes from -15 to +15.

Tuesday 4 September 2012

Year 12 Physics work September 2012

§1. Key words for electricity from GCSE – if this is the answer, what is the question?

Series, parallel, voltage, current, joules, resistance, diode, LDR

E.g. if the answer is Physics, question could be "What is Ms Hamnett's favourite subject?"
2. Find a recent article about particle physics e.g. in newspaper or New Scientist and prepare a 1 minute summary of what it is about

3. Here is the Physics "joke"
Einstein walks into a bar. Because of his relatively low velocity, time dilation effects are negligible and nothing amusing happens.
Why might some people find this funny?

Friday 11 May 2012

Revision sessions

The revision sessions below are available as well as Tuesdays after school.

Day	Date	Period	Room	Topic
Wed	16/5	1	W8	Particles, quantum
Wed	16/5	2	R21	Electricity
Fri	18/5	3	R21	Optics
Fri	18/5	4	W8	Suvat etc
Wed	23/5	1	W8	Moments
Wed	23/5	2	R21	Waves

Monday 23 April 2012

This is just to inform you about the fact that there are several free public talks and events relating to astronomy in Oxford in the next few months which look interesting.
Finding the Big Bang

27^th Apr 2012, 5:00pm - 6:00pm

Astrophysics are hosting a public lecture about the big bang and the expanding universe. More information can be found here: http://www2.physics.ox.ac.uk/events/2012/04/27/public-lecture-%E2%80%98finding-the-big-bang%E2%80%99-professor-p-james-peebles.

Monday 28 May at 6pm to 7pm
Just A Black Dot?
On 5 June 2012, Venus will appear as a perfect black dot crossing the face of the Sun. This is known as a transit and is a very rare event to view from Earth. Only Venus and Mercury are placed to do this, and only then when there is an exact alignment of orbits. Though occurring in pairs a few years apart, this is generally a 'once-in-a-lifetime' experience.

The talk will look at the historical importance and Oxford's connections, the details of this year's transit and the modern relevance of making accurate transit observations.

Speaker: Charles Barclay, Director, Blackett Observatory, Marlborough College and Associate Fellow, Green Templeton College.
Please note that registration is essential if you wish to attend this lecture. for more information and to register, click on the link below
http://www.gtc.ox.ac.uk/whats-on/venus-2012/venus-2012-events-programme.html

Exploring the Distant Universe

Saturday 2 June 2012 at 2pm
A public lecture for the family.
Over the next ten years our understanding of the Universe will be transformed by a new generation of both space and ground-based telescopes.

The 20-year-old Hubble Space Telescope will be replaced by the James Webb Space Telescope (JWST). Discover how the JWST, with a mirror five times larger than Hubble, will allow us to identify not only the most distant stars and galaxies in the Universe, but also find planets approaching the size of the Earth orbiting other stars.
Find out how a new class of ground-based 'Extremely Large Telescopes' (ELTs) will complement JWST with their ability to obtain exquisitely detailed observations of individual objects such as distant galaxies.

Speaker: Stephen Wilkins, Oxford Astrophysics.
For more info click on the link http://www.gtc.ox.ac.uk/whats-on/venus-2012/venus-2012-events-programme/exporing-the-universe-the-next-generation-of-telescopes.html
Please let me know if you have any further questions - you can contact me at cha@cheney.oxon.sch.uk

Friday 30 March 2012

Optics work for Easter

Click on the link below and complete the activiey on the sheet using the simulation
http://www.scribd.com/doc/87334127?secret_password=qwquo2a624vlnurnsu
Bring your completed sheet to the first lesson back after Easter
There is also plenty of work set on kerboodle
Happy Easter!
Ms Hamnett

Friday 16 March 2012

Practice questions

Here is the link for the practice questions for the resit ISA. The practical will take place on Tuesday 20th March after school , and the exam on Friday in lessons. Please bring your answers to the questions below to the ISA on Tuesday. No answers = no repeating the ISA.
http://www.scribd.com/doc/85942318?secret_password=20c7b8jpjuelqojcbx5o

Tuesday 28 February 2012

Link to Q11 test now corrected

The link in the previous below should now work for the test about resistivity
Enjoy
Ms Hamnett

Thursday 23 February 2012

ISA tips 2013

Here is the checklist and the uncertainties guide

AQA world ISA guide to calculating uncertainty

Is the variable independent (you change it) or dependent (several values and a mean)?
For independent variable, uncertainty is + or – smallest measurement on instrument
For dependent, plus or minus half the range,
Percentage uncertainty independent is precision / value then x 100%
Percentage uncertainty dependent is 0.5 x range / mean then x 100%
For percentage uncertainty of a calculated value, find the total percentage uncertainty by adding the parts of each calculation together

ISA Analysis

Stage One (graph and table)

What are you losing marks on?

Precision

Units

Calculations

Plotting

Scales

Best fit line

Section A (about your experiment)

What are you losing marks on?

Variables

Accuracy questions

Uncertainties
Improvements

Section B (related experiment)

What are you losing marks on?

Calculations

Variables

Graph plotting

Gradient calculation

“Theory predicts that…” rearranging equations

Describing another experiment

links to practice ISA papers

Follow the links below to the practice ISA papers. Use the guide on the next blog to work out your strengths and weaknesses and work on these - bring any questions to the after school session on Tuesday in w10

Q11 task sheet

http://www.scribd.com/doc/82486769?secret_password=6yk4h2zyiht7xa9jua2

Q11 test

http://www.scribd.com/doc/83098413/Phy3t-q11-Test?secret_password=2b0g9biyhelcyikh23d2

Q11 marking guidance

http://www.scribd.com/doc/82486725?secret_password=2d0chzhonh91f30l9049

P11 task sheet

http://www.scribd.com/doc/82486657?secret_password=1m9gtl17vq6yc8t54ghg

P11 test

http://www.scribd.com/doc/82486667?secret_password=7nxubppgf99xmwao44n

P11 marking guidance

http://www.scribd.com/doc/82486648?secret_password=2kuq8zzb9ufbnt20yjam