Hands up for Mr Mallon!
He’s shared another last minute example, this time it’s an internal resistance problem for Higher Physics.
with mr mackenzie
Hands up for Mr Mallon!
He’s shared another last minute example, this time it’s an internal resistance problem for Higher Physics.
I’ve used some study leave time to complete the set of questions I said I would give you for your mobile phone. From the class survey, it looks like 240 pixels wide by 320 pixels high is the ideal size for one of these. There are 18 questions, “stolen” from some very old SQA multiple choice papers I found in a cupboard. I’ve tweaked a couple of them to bring them up to date with the current course content.
To use the questions on your phone:
*make sure your phone displays them in numerical order, i.e. Q0010.jpg, then Q0011.jpg, etc. – otherwise you’ll get the answer before the question!
I had to send the files individually by bluetooth because my bluetooth program reversed their order. You might need to check which order your bluetooth or usb transfer uses & send them in the wrong order to get it right on your phone. Ask me if you’re still not sure how to do this.
Here’s a sample question:
Animated gif showing fission of U-235 by Stephan-Xp
We’ve discussed nuclear fission in class this week. This is the process where an unstable nucleus splits into 2 or more smaller nuclei. The new atoms produced are called daughter products of the fission process. The University of California has a good animation of the fission process with commentary. I have also included a link below to a nice animation from atomicarchive.com.
In the last part of the Higher course, we looked at the structure of the atom. Rutherford scattering of alpha particles fired at a very thin sheet of gold foil provided the evidence to develop our understanding of the atom from a “plum pudding” model to a “nuclear” atom – where most of the matter and mass are concentrated in the centre, or nucleus, of the atom.
There is a really good youtube video about Rutherford & alpha particle scattering – watch the first 5 minutes only, it goes on to another topic after that. You can also follow the link below (the download link at end of post) to watch an animation of the alpha particle scattering experiment and follow how the results changed our view of the atom.
You will get your first chance to sit the unit 3 NAB next week. In the meantime, I have attached a set of revision note for unit 3 to help with your revision.
If you have to resit the unit 1 NAB on Wednesday (29th), here are some links to help with your revision.
unit 1 summary (PowerPoint)
unit 1 revision notes (pdf)
notes on vectors (pdf)
St. Kentigern’s Academy revision notes: units 1.1 & 1.2, 1.3 & 1.4 and 1.5 & 1.6 there is also a revision test and you can check your answers.
If you are resitting the unit 2 NAB next Wednesday (29th April), you might want to look at the following revision sites:
TPD, EMF and internal resistance
Unit 2 summary (Powerpoint)
Whole course summary notes (pdf)
St. Kentigern’s Academy Notes: unit 2.1, unit 2.2, unit 2.3, unit 2.4, revision questions, answers to revision questions
I found an useful simulation of the photoelectric effect here. You can change the metal under investigation (we used Zinc in class). You can also vary the wavelength and irradiance of the light. Notice that below the theshold frequency you can’t get any photoelectrons, even if you set the light to its brightest setting.
We looked at the photoelectric effect this week. I’ve been looking for some video demonstrations but there are very few explanations that I would be happy to recommend. The animation I used in class is available here. I also found a nice demonstration on youtube (see below) that uses a different type of electroscope to indicate the presence of charge.
This video is also attached as a podcast.
Here is your homework on the unit 3 topics we covered before the Easter holidays. Please hand your work in no later than Friday 24th April.