Today we attempted to light a match using a heat lamp and a concave mirror. We then watched a demonstration of the Tyndal experiment that showed how optical fibres work.
All of this was to investigate uses of IR.
Today we used a microwave to calculate the speed of light!
We looked at a computer simulation of how a microwave works and then used marshmallows to find its wavelength. There is a video of how to perform the calculation with chocolate if you want to see it again.
All must be able to state uses of radio waves (C Grade)
Most should be able to relate the properties of a radio wave to its uses (B Grade)
Some could be able to explain refraction of radio waves (A/A* Grade)
Today we looked at the use of EM waves in communications particularly radio waves and microwaves, comparing how the two are used.
We modelled diffraction of radio and microwaves outside to investigate why Issy's radio worked in a valley by Jay's phone didn't and linked diffraction and refraction to the use of satellites.
Prep: finish your poster on the EM spectrum and its uses. Due Tuesday
Aim: to make a poster on the EM Spectrum
All must be able to state the constituents of the EM Spectrum (C Grade)
Most should be able to describe the EM field that makes up light (B Grade)
Some could be able to relate uses of the EM spectrum to their properties (A/A* Grade)
Today we looked at an overview of the electromagnetic spectrum using devices set up in the classroom: a radio, TV, mobile phone, microwave, heat lamp, light filters, UV lamp and an X-ray of a broken knee cap.
You then carried out research to begin to make a poster about the EM spectrum and its uses using info sheets placed around the room, a table of wavelength and frequencies for the EM spectrum and your Physics for You books.
Don't forget: Physics for You homework due in tomorrow!
This week's homework: Finish your EM spectrum poster by next Tuesday.