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Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards , matching games , practice electronic assessments , and live quizzes.
Only 30% of the Sun's ultraviolet light reaches the ground, and almost all of this is well transmitted. Visible light is well transmitted in air, a property known as an atmospheric window , as it is not energetic enough to excite nitrogen, oxygen, or ozone, but too energetic to excite molecular vibrational frequencies of water vapor and CO2.
The cone cells in the human eye are of three types which respond differently across the visible spectrum and the cumulative response peaks at a wavelength of around 555 nm. Therefore, two sources of light which produce the same intensity (W/m 2) of visible light do not necessarily appear equally bright. The photometry units are designed to take ...
Visible-light astronomy has existed as long as people have been looking up at the night sky, although it has since improved in its observational capabilities since the invention of the telescope, which is commonly credited to Hans Lippershey, a German-Dutch spectacle-maker, [1] although Galileo played a large role in the development and ...
In The Republic (509d–510a), Socrates describes the divided line to Glaucon this way: . Now take a line which has been cut into two unequal parts, and divide each of them again in the same proportion, [1] and suppose the two main divisions to answer, one to the visible and the other to the intelligible, and then compare the subdivisions in respect of their clearness and want of clearness ...
Proper testing technique is to give only three seconds per plate for an answer, and not allow coaching, touching or tracing of the numbers by the subject. The test is best given in random sequence, if possible, to reduce the effectiveness of prior memorization of the answers by subjects.
2. Click Vacation response. 3. Toggle on or off Enable vacation response. 4. Select the dates you want it active. 5. Enter your response message. 6. Click Save. Turn on another response for specific domains. 1. Toggle on or off Add another response. 2. Enter up to 2 domains (like aol.com or yahoo.com). 3. Enter a different message in the box. 4 ...
He*(2 1 S) + Ne 1 S 0 + ΔE → He(1 S 0) + Ne*5s 2, where * represents an excited state, and ΔE is the small energy difference between the energy states of the two atoms, of the order of 0.05 eV, or 387 cm −1, which is supplied by kinetic energy. Excitation-energy transfer increases the population of the neon 4s 2 and 5s 2 levels manyfold.