Higher

photoelectric effect

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picture-1

We looked at the photoelectric effect this week.  There is a useful simulation of the photoelectric effect here.  You can change the metal under investigation to confirm that different metals have different work function values.  You can also vary the wavelength and irradiance of the light.

Notice that below the theshold frequency you can’t get any photoelectrons, even if you set the light to its brightest setting.

Newton III in action – continued

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This amazing footage of the Saturn V rocket launch for the Apollo11 moon landing mission has been put online by Mark Gray.  The video provides an extra dimension to the launch photograph in my earlier post about Newton’s 3rd law of motion.  While that picture shows an enormous plume of gas being forced out of each rocket exhaust, the video below demonstrates the heat of the gases and the effect they have on the structure of the launch pad itself.

Apollo 11 Saturn V Launch (HD) Camera E-8 from Mark Gray on Vimeo.

Podcast: Play in new window | Download

1992 Higher paper I

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I’ve had a request to include the old multiple choice papers in this series of posts.  Here is paper I from 1992, there are some written questions at the end of the paper.

There is a complete set of answers for this paper here.

This paper is reproduced to support SQA qualifications on a non-commercial basis according to SQA conditions of use.