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By mrmackenzie, October 25, 2011 8:30 pm

Here is the answer to the amplitude question.

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By mrmackenzie, October 25, 2011 8:27 pm

This is the solution to the frequency question.

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By mrmackenzie, October 25, 2011 8:23 pm

Here is the answer to the wavelength question.

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By mrmackenzie, October 25, 2011 8:19 pm

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.

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

Podcast Video [ 1:09 ] Download (82)

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By mrmackenzie, October 24, 2011 8:29 am

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.

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By mrmackenzie, October 24, 2011 8:20 am

What’s inside a colour portable TV?

inside a tv set from mr mackenzie on Vimeo.

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By mrmackenzie, October 24, 2011 8:19 am

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.

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By mrmackenzie, October 11, 2011 10:21 pm

I am moving this site to a new hosting company during the holidays.  You might notice some broken links or missing videos.  Please let me know by leaving a comment so I can fix anything I have missed.

Past papers are currently unavailable on the AH, Higher & Int2 pages.  Some (not all) can be found by typing “pastpaper” in the search box at the top of the page.

Thanks.

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By mrmackenzie, October 9, 2011 12:50 pm

Here is a short video showing some examples of total internal reflection.

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By mrmackenzie, October 6, 2011 12:35 am

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.

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

Podcast Video [ 29:04 ] Download (215)