Standard Grade

standard grade physics is in here

S3 homework solutions

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I have recorded some short videos to help you review your recent homework exercise.  Here is the answer to part (a) of the data logger question.

[vimeo http://www.vimeo.com/31104699 w=400&h=300]

You can download a copy of any of these homework video files using the download link under each post.

Podcast: Play in new window | Download

How a TV set works – part 3

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The site I have been using throughout the television section of the course is here.

The shadow mask makes sure that electrons fired from the filament responsible for each colour of sub-pixel do not hit the wrong phosphor dots, e.g. electrons sent by the “green” gun do not reach the phosphor dots that glow red or blue. This animation shows how the shadow mask works.

 

Remember: electrons do not have a colour.  Colour is only produced when electrons collide with phosphor paint.

How a TV set works – part 1

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Here is a short video clip showing how an image can be built up on a TV screen, one line at a time. In a real TV set, the beam moves much more quickly (about 7000 m/s!) across the screen and 25 complete images are shown each second.

raster scan from mr mackenzie on Vimeo.

Remember that in a real TV set, the beam does not scan its way back up the screen but takes a “flyback” from the bottom right to the top left corner to start on the next image.

decommissioning Dounreay – Bang Goes the Theory

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This week’s episode of Band Goes the Theory was about the Fukushima disaster in Japan.  Part of the programme was filmed at Dounreay, where Dallas investigated the methods being used to decontaminate the site.  You can watch the part about Dounreay by playing this clip.

[vimeo http://www.vimeo.com/30104697 w=400&h=300]

The whole programme is available for download using the link below (large download).

Podcast: Play in new window | Download