We made some notes on what the 'Big Bang' theory states, and the other main piece of evidence for it - Cosmic Microwave Background Radiation.
I gave out the list of things you need to know for the end of year examination.
Go through this list and highlight areas you want to target in the remaining revision lessons we have.
No lesson - school photo
We did a revision quiz.
We made some notes on Hubble's law and the evidence that the universe seems to be expanding.
We also spoke about why we are not at the centre of the expansion, even though all galaxies are moving away from us.
Read and make notes on P122-3, particularly:
What is the big bang? What is the evidence for it? (Hubble's discovery + CMBR)
This video is pretty good - though you don't have to make notes on it as some of the stuff is not on the syllabus.
We went through the test.
I started to demonstrate the Doppler effect using this website.
Play with the website linked to above. Click the page to start making waves, and click and drag to make the plane move as it emits waves.
Use your phone as a timer, and work out the period and frequency of the waves when the source is stationary. (we won't worry about the wavelength as your screens may be different sizes so this will differ)
Then make the plane move, and put the mouse pointer in front of the plane. Verify that the period of the waves passing the mouse pointer is shorter (and the frequency is higher) compared with when the source is not moving.
Do the same with the mouse pointer behind the plane, and check that the period of waves arriving is longer and the frequency therefore lower.
Then watch this video and make notes on the Doppler effect. Bring notes to next lesson.
We did a bingo game and some revision.
We did the end of topic test.
We did some recap questions using mini whiteboards.
We went through the uses and dangers of UV, x-rays and gamma rays.
We made notes on ionizing radiation, and on the use of x-rays and gamma rays for radiotherapy.
We went through the homework and discussed terminal velocity in the context of a car accelerating until it reaches its top speed.
Read P32-33 and watch this video about stopping a car. Make notes on these, and bring to next lesson. The video is a bit annoying, because it uses units of miles per hour and feet, but otherwise it's ok.
We made notes on terminal velocity and watched this short mythbusters clip, though it doesn't exactly include a lot of physics.
Answer Q1 and 3 on P35 and bring to next lesson.
Also you could optionally investigate the terminal velocities of different animals, and find out more about that spider I mentioned that is carried around the world on air currents because its terminal velocity is so slow.
I gave you some feedback on the homework, and the ideal exam-style answer.
Remember it is not the change in momentum that matters in this case - it's the rate of change of momentum that determines the force.
We built and tested crumple zones:
We went through the homework questions.
We made some notes on forces and momentum, and force = change in momentum / time
Note that the video above is pretty basic - if you want more detail then I recommend this video too.
Going through homework
We went through the homework from last lesson, and looked at the different things that can happen to neutrons in a nuclear reactor.
You need to make notes on the use of control rods and the role of water as a moderator (to slow down neutrons). The textbook and these videos should help you - they also explain how the reactor is used to produce electricity, but you don't need to make notes on that aspect - we'll do that next lesson.
This video gives you a good overview of how a nuclear reactor works, but does not mention water as a moderator. This video says a bit more about water as a moderator - the link skips straight to 2:22 which is when he starts talking about it.
Bring your notes on control rods and the use of water as a moderator to next lesson.
We went through a couple of difficult questions from the test. Please ensure you do all your corrections and ask me if there is anything you still don't understand.
We introduced nuclear fission - watch this video if you missed the lesson or need a recap - it's a good video except that every time he says 'atom' you should replace it with the word 'nucleus' - what happens to the rest of the atom (i.e. the electrons) is basically irrelevant.
Read P222-3 and Answer Q1-2.
Bring to next lesson.
Going through test
We went through the test, though quite a few people weren't there.
Recap + Test
We looked at different situations where long and short half-lives are desired, and learned about carbon dating.
Read and make notes about how gamma sterilization works using this page (you don't have to make notes about the other methods like ethylene oxide and electron beams, but they are interesting to compare).
Read about a few of the uses of gamma sterilization here - no need to make copious notes on this, but it's interesting to see the variety of applications.