The InThinking Physics site has been a life saver. Chris's explanations of syllabus content and assessment criteria have helped enormously with planning and programming. The inclusion of marked IAs in particular was really beneficial when I started teaching...

Kate Baldry, The Friends School, Australia

I was new to teaching IB and moved to a brand new school with no other Physics teacher and no resources at all... With the huge help from the InThinking Physics site I was able to put in place a course with no problems at all. It has been like having...

Graeme Keer-Keer, Alcanta International School, China

This site is well organized and thorough. It gives great insight into the content and how connections can be made for students. I have been using it to help me prepare for the 2016 assessment, and have used resources for each content area and laboratories...

Steven Rines, American School of Bombay, India

Blogsee all

Measuring angles from photo

25 September 2019

Amtul asked how to measure angles on a digital photo of light reflecting off a curved mirror, here's how to do it in GeoGebra.First I insert... more

The big bang

10 September 2019

The PhET simulation is great but you can't beat real balloons for introducing electric fields. This year I bought extra big ones, not so good... more

Subscriber comments

  • 13 Oct Chris Hamper
    Wave nature of matter
    Strange. The D-G experiment definitely uses the maximum but 2dsintheta instead of d. I reckon they are expecting students to use the single slit formula even though they use d and not b. Would be interesting to know what alternative answers...
  • 13 Oct David Hawthorn
    Wave nature of matter
    A beam of electrons each of de Broglie wavelength 2.4 x10^-15m is incident on a thin film of silicon-30. The variation in the electron intensity of the beam with scattering angle is shown [standard Davisson-Germer experiment graph shown but...
  • 12 Oct Chris Hamper
    Wave nature of matter
    Hi David; Reading what I wrote on p289 I can see that it might lead to some confusion as I mention the pattern looks like that made by a circular aperture then use the diffraction grating equation. A full understanding of the Davisson - Germer...
  • 11 Oct Chris Hamper
    Wave nature of matter
    I am at the airport with only my phone. I’ll get back to you when I’m home.
  • 10 Oct David Hawthorn
    Wave nature of matter
    "Describe the two slit experiment for electrons." I'm a bit confused about this after reading the markscheme for 2019 TZ1 HL paper 2 Q2a)i) The markscheme uses the angle for a minimum intensity rather than a maximum intensity. The syllabus...
  • 8 Oct Chris Hamper
    Ideas for investigations
    Yeah should be ok.
  • 8 Oct Chris Hamper
    Individual investigation
    Could be ok but would need to define efficiency. Do they have a model car with at least 5 different sizes of wheel.
  • 6 Oct Amtul Qayyum
    Ideas for investigations
    Instead of the ball can he use a square sheet.
  • 6 Oct Amtul Qayyum
    Individual investigation
    Chris one of my student would like to do an IA on "Does the radius of a car tyre affect its efficiency?" Will that make a good IA?
  • 1 Oct Chris Hamper
    Thanks Roberta, now fixed.
  • 1 Oct Roberta Rodriquez
    Hi Chris, the link above doesn't work, but this does
  • I'm afraid not. Maybe I'll make one :-)


Higher Level Physics

Higher Level Physics by Chris Hamper. Comprehensive coverage of the entire HL course.

more info