Tuesday, April 15, 2014
Monday, April 14, 2014
Here is the video with the steps to create one:
And here is my first picture that I took with my smartphone:
Sunday, April 13, 2014
Saturday, April 12, 2014
A message from my friend Rosa Doran:
"Book these dates in your callendar:
September 1st to 5th - GTTP international training
September 8th to 12th - GHOU2014 / Astronomy Education Alliance Meeting
This year our anual meeting (Global Hands-on Universe 2014) will take place in Portugal. This time the meeting is in partnership with some major events. The event will take place in parallel with the Europlanet Science Congress 2014 and in the framework of a major Astronomy Education event: The Astronomy Education Alliance Meeting. The aim is to set the stage to discuss the latest innovative efforts in astronomy education, allowing teachers, educators and outreach professionals to combine efforts and focus astronomy resource production on cross cultural curricula utilizing formal education best practices.
You can find all information regarding the meeting here: http://handsonuniverse.org/astroeducation/
As already is our tradition we will be hosting during the week before this major event, the GTTP international training. There are special conditions for people willing to attend this training session. All the information can be found here: http://gttp.ea.gr
We hope that you will join us in this event. We promise this will be an unforgetable experience in sunny Portugal. Some nice surprises are here waiting for you. Please join and spread the word."
I hope you can join us :)
Thursday, April 10, 2014
Friday, April 4, 2014
|A Crookes Tube. Credit: Wikipedia|
His work on electricity in high vacuum, leads us to cathode rays tubes (the technology behind the creation of television).The Crookes tube is an early experimental electrical discharge tube, with partial vacuum, in which cathode rays, streams of electrons, were discovered. The Crookes tube consists of a partially evacuated glass container of various shapes, with two metal electrodes, the cathode and the anode, one at either end. When a high voltage is applied between the electrodes, cathode rays (electrons) are projected in straight lines from the cathode. It was used by Crookes, Johann Hittorf, Julius Plücker, Eugen Goldstein, Heinrich Hertz, Philipp Lenard and others to discover the properties of cathode rays, culminating in J.J. Thomson's 1897 identification of cathode rays as negatively charged particles, which were later named electrons.
Crookes tubes are now used only for demonstrating cathode rays.
|Crookes radiometer in action. Credit: wikipedia|
It is still manufactured and sold as an educational aid or curiosity.
The vanes are:
- polished or white on one side,
- black on the other.
Cooling the radiometer causes rotation in the opposite direction.
- How does a light-mill work?-Physics FAQ
- The Cathode Ray Tube site
- Bell, Mary; Green, S. E. (1933), "On Radiometer Action and the Pressure of Radiation", Proceedings of the Physical Society 45 (2): 320–357,Bibcode:1933PPS....45..320B, doi:10.1088/0959-5309/45/2/315. 1933 Bell and Green experiment describing the effect of different gas pressures on the vanes.
- The Properties of the Force Exerted in a Radiometer
- Crookes' Radiometer, Wikipedia, April, 04, 2014
Monday, March 31, 2014
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