File:Atomic Fountain.jpg
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Summary
DescriptionAtomic Fountain.jpg |
On Sunday, I toured the 30 ft. tall atom fountain in the bowels of Stanford... an atom interferometer that will test the equivalence principle of Einstein’s theory of general relativity…. Does everything experience the same local gravitational pull form the Earth, regardless of mass? It's the working end of Puzzle 94 From the bottom of this vertical tube, Rb85 and Rb87 atoms shoot up and then fall back by gravity in a race, like the hammer and feather on the moon, but with insane precision. Their position is only resolved by observation on their return. At apogee near the top of this photo, they are in a cloud spread over 10 centimeters of superposition. Jason Hogan and team hopes to detect differences in gravity to 15 or maybe 16 decimal places. If they see a difference, it could suggest a fifth fundamental force (beyond electromagnetism, gravity, strong and weak forces) that operates over long distances (meters to Earths). Interestingly, this work started in Steven Chu’s group (now head of the DOE) using a 10x smaller cesium fountain. And a similarly short cesium fountain is the NIST atomic clock (the primary time and frequency standard in the U.S.). |
Date | |
Source |
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Author | Steve Jurvetson from Menlo Park, USA |
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This image, originally posted to Flickr, was reviewed on 1 June 2012 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date. |
Items portrayed in this file
depicts
28 February 2010
0.004 second
24 millimetre
4,000
image/jpeg
1f869863b50435752f6ed4aebc684ad69a4d595a
2,812,708 byte
3,645 pixel
3,645 pixel
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 05:48, 1 June 2012 | 3,645 × 3,645 (2.68 MB) | wikimediacommons>File Upload Bot (Magnus Manske) | Transferred from Flickr by User:bomazi using flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon EOS 5D Mark II |
Exposure time | 1/250 sec (0.004) |
F Number | f/4 |
ISO speed rating | 4,000 |
Date and time of data generation | 14:21, 28 February 2010 |
Lens focal length | 24 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | QuickTime 7.6.3 |
File change date and time | 19:34, 2 March 2010 |
Y and C positioning | Co-sited |
Exposure Programme | Aperture priority |
Exif version | 2.2 |
Date and time of digitising | 14:21, 28 February 2010 |
Meaning of each component |
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APEX shutter speed | 8 |
APEX aperture | 4 |
APEX exposure bias | 0 |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
DateTime subseconds | 48 |
DateTimeOriginal subseconds | 48 |
DateTimeDigitised subseconds | 48 |
Supported Flashpix version | 1 |
Colour space | sRGB |
Focal plane X resolution | 3,849.2117888965 |
Focal plane Y resolution | 3,908.1419624217 |
Focal plane resolution unit | inches |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |
GPS tag version | 2.2.0.0 |
JPEG file comment | AppleMark |