Today we had a test on the EM Spectrum and its uses.
Prep: Revise for the exam. Bring one question to next lesson from you revision. 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. 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 attempted to light a match using a heat lamp and a concave mirror (it did by the end but only Chris saw). 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 looked at dispersion in a prism and some of the properties of visible light: how it can be split by two prisms and how to make a lens.
Today we looked at the uses of UV light.
We watched a video on underwater fluorescence to see how that protects coral in hot countries. We wrote secret messages with UV pens, made tonic water, teeth and dirty clothes glow and saw that £5 and £10 notes have UV security marks on them. We then had a discussion about the dangers of UV light and sunburn. Today we completed our tour of the EM spectrum with X-Rays and Gamma Rays.
We found out how an X-Ray takes an image, using lots of knowledge from the members of the class who had done extra work and researched it. We then found out about the dangers of ionising radiation and how it can cause cancer. Prep: Re 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. Today we looked at telecommunications and compared the diffraction of Radio waves to Microwaves and their uses. We went outside and found out why radios but not mobiles work in valleys.
In today's lesson you carried out research to create a poster on the uses of the various parts of th
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