The notes are here and the wording of the explanations is quite important.
We also discussed whether or not we are at the centre of the universe's expansion. This is not on the syllabus but it's nice to understand.
We then considered what could happen to the universe in future.
Doppler effect, red shift
Classwork
We went over key ideas about the Doppler effect from your HW.
I demonstrated this page which is really useful for seeing the cause of the Doppler efect.
We discussed the doppler effect for light, and 'blue shift' and 'red shift'.
You started to watch this video which shows how the theory of the Big Bang developed. More on this next lesson.
Doppler Effect
Classwork
We went through the test on waves.
You made notes on proportionality, and different ways to test for it.
I gave out the list of stuff you need to know for the end of year exam.
We started to make notes on the Doppler effect, and we went to the field where I demonstrated it using sound.
Homework
Watch this video about the doppler effect and add to your notes.
This interactive page is really good. Click and drag to fly the plane and see the waves.
Make sure you have diagrams showing a source of waves moving towards an observer and away from an observer. (or you could do one diagram with two observers, one in front and one behind the source of waves.)
Bring your notes and any questions to next lesson.
Bank Holiday
Test
Classwork
We did some revision, then did the test on Waves.
Homework
No homework.
Cover Lesson
Classwork
Revise for the test on Thursday.
I gave out the answers to the textbook questions in the lesson.
Homework
Revise.
EM Applications
Classwork
We got lots done today.
We went over the HW and I demonstrated the question about the tea tray using a speaker as the source of waves and a microphone as the detector.
You made notes on x-rays and CT scans, and we watched this video which gives a nice explanation.
You then made notes on radiotherapy, and how damage to healthy tissue is minimized. We watched this video which shows x-rays being used to treat cancer.
You made notes on sterilization, and the particular use of x-rays and gamma rays because they are so penetrating.
Homework
You might want to watch this video which shows a gamma sterilization plant.
Revise for a test on waves next week. Monday will be a cover lesson for revision, then we will do the test on Thursday.
Diffraction & Interference
Classwork
You did the questions on diffraction on P73 and we went through them together.
Finish the past paper questions and hand in tomorrow morning before registration.
Work and Energy
Classwork
We started to make notes on work and energy transfers.
We recapped on energy transfers, and on using Sankey diagrams to visualise them.
Homework
Continue your notes on work.
Use P40-41 and the first half of this video - stop when he starts talking about asteroids.
Bring your notes to next lesson, when we will do some examples.
Hooke's Law
Classwork
We made notes on Hooke's Law, including the definition and equation.
We did an experiment to collect more force/extrnsion data up to the point where a spring breaks.
We considered what is meant by 'proportionality', and looked at graphs for things that were or were not proportional.
Homework
Answer Q6-7 on P38. Leave out 7b (the graph).
Hand in tomorrow morning before registration.
Hooke's Law
Classwork
We did the practical shown in the video from last lesson's HW.
Homework
Plot a graph of EITHER F on y-axis and ΔL on x-axis OR T on y-axis and m on x-axis.
Write a short conclusion ON THE GRAPH PAPER.
Hand in tomorrow morning before registration.
Skydiver
Classwork
We went through the force diagrams for various stages of a skydiver doing a parachute jump.
We dealt with the misconception of the skydiver moving upwards when the parachute is opened.
You drew a speed-time graph for a skydiver and annotated it.
You answered the questions on P35 and we went through most of them together.
Homework
Watch this video which shows an experiment you will do next week.
The video is not in English - try to work out what is going on. I will ask some of you to do a voiceover in English next lesson.
Terminal Speed
Classwork
You plotted graphs of a paper cone being droppen and reaching its terminal speed.
We started to go through the explanation of why objects reach a terminal speed - we will continue with this next lesson.
Homework
For some reason I didn't set a homework.
If you didn't have your notes to show me today please make sure you bring them next lesson.
Terminal Speed
Classwork
You predicted how a feather and a rubber would fall when dropped.
We did this experiment using a slow motion camera and compared the results to the predictions. You decided that air resistance caused the two objects to fall differently.
We made notes on the definition of half-life, defined 'activity', and contrasted activity with count rate.
You did an activity with dice to model radioactive decay.
Homework
Each person in your pair should plot a graph of EITHER dice remaining against time, OR "activity" against time.
BOTH of you should add a curve of best fit, and calculate the "half-life" of your dice.
Hand your graphs in tomorrow morning before registration.
Half-life
Classwork
We did a starter question to practise half-life calculations.
I did a demonstration (with some useful assistants) to show you the decay of an isotope of protactinium.
The results are here (I removed the first minute or so as the layer was still separating out) - we will find the half-life at the start of next lesson.
We also refreshed your Excel skills when collecting and processing the data to get the corrected count rate in counts per minute.
Homework
Answer the questions on P217 and hand in before registration tomorrow morning.
Uses of alpha, beta, gamma
Classwork
We went through key uses in detail - alpha in smoke alarms, beta in paper manufacture, gamma in radiotherapy, sterilization and leak detection.
Homework
Watch this video and use P216-7 to make notes on half-life.
Bring your notes to next lesson.
Background radiation
Classwork
We identified the deacy processes in a decay chain.
We went through the HW, classifying sources of background radiation as natural or man-made.
I'm trialling a web-based whiteboard - you can now see notes from lessons here. We'll see if it's any good...
We started the questions on P213 and went through Q1.
Homework
Research one use each for alpha, beta and gamma radiation.