How strange! The sky is blue!

Written by K.A.Cassimally

Look up! Just do it. What do you see? Stupid question, eh? You seerepparttar ceiling of course. When you look upwards during a sunny day while picnicking however, you seerepparttar 127653 blue sky. Ever wondered whyrepparttar 127654 sky is not green nor but blue?

Before answering this question, let’s go back torepparttar 127655 basic physics of light. Sorry, but here I go…

Light is a kind of energy, which travels in waves. In fact, light is a wave of vibrating electric and magnetic fields. Light forms only one small part of a larger range of vibrating electromagnetic fields calledrepparttar 127656 electromagnetic spectrum. Electromagnetic waves travel through space at an amazing 300 00km/s. Therefore this is alsorepparttar 127657 speed of light.

When you see white light fromrepparttar 127658 bulb, you are actually seeingrepparttar 127659 seven colours ofrepparttar 127660 rainbow! This is because white light consists of a combination of these seven colours.

Each of these colours has a different wavelength, frequency and energy. Wavelength isrepparttar 127661 distance betweenrepparttar 127662 crests ofrepparttar 127663 waves. The frequency isrepparttar 127664 number of waves that pass by each second. Note thatrepparttar 127665 longerrepparttar 127666 wavelength,repparttar 127667 lowerrepparttar 127668 frequency andrepparttar 127669 less energy it contains.

·Violet: Shortest wavelength, highest frequency and energy ·Red: Longest wavelength, lowest frequency and energy

Now back to our main topic. That blue colour ofrepparttar 127670 sky is due to an effect known asrepparttar 127671 Rayleigh scattering. As light fromrepparttar 127672 sun moves towards Earth’s atmosphere, not allrepparttar 127673 colours are actually able to pass through that atmosphere. Most ofrepparttar 127674 longer wavelength colours do pass (red, orange and yellow for sure) butrepparttar 127675 shorter wavelength ones however are mostly absorbed by gas molecules found inrepparttar 127676 atmosphere. Absorbed blue light is then bounced back (radiated would be a better word) in all directions. This makesrepparttar 127677 shy to appear blue!

NABGG (Nat'l Assoc. of Black Geologists & Geophysicists) 23rd Annual Conference 9/15 – 9/18, 2004 - Austin, Texas

Written by Robert Johnson

The NABGG (National Association of Black Geologists and Geophysicists) will hold it’s 23rd annual conference on Wednesday, September 15 – Saturday, September 18, 2004.

HOUSTON, TX (PRWEB) August 18, 2004 -- Please plan to join us, as we convene our 23rd annual meeting that will be held in Austin, Texas withrepparttar University of Texas at Austin serving asrepparttar 127652 host institution. Heralding excellent research and technology,repparttar 127653 University of Texas at Austin’s Geoscience Department is a world class department that has consistently produced some ofrepparttar 127654 most influential experts inrepparttar 127655 field of geoscience.

This year’s conference theme “Partnering Our Different Worlds” conveysrepparttar 127656 concept ofrepparttar 127657 connectivity ofrepparttar 127658 different aspects of geoscience in our society, including Oil & Gas, Environmental Sciences, Academia, Professional Societies, and Governmental Agencies.

Some ofrepparttar 127659 highlights include: Keynote Speakers:

-Dr. Sandra K. Johnson, Manager, IBM Linux Technology Center -Dr. Jerry Harris, Head of Geophysics Department, Stanford University -Dr. Edwin Dorn, Dean, Lyndon B. Johnson School of Public Affairs, University of Texas at Austin. -Dr. William L. Fisher, Director ofrepparttar 127660 Jackson School of Geosciences, University of Texas at Austin.

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