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Astrology
Astrology What kind of foolishness is astrology? You read about Sun Signs in the paper and you can see almost every sign says something ambiguous or relevant in some general way. Surely no real science or serious people ever believed such...
Monkey Ears
Just the other day I was talking to Ziggy, my Helping Hands capuchin monkey, and she looked at me quizzically and said, "Huh? Speak up!" I have been operating under the assumption that her eyesight and hearing was equal to or better than ours. What...
Putting Flower Essences on the Map.
Putting Flower Essences on the Map.
In this world of greater understanding that all things are
connected, the idea of sending healing, love and blessings is
not so impossible. We have science backing up metaphysics, such
as String Theory....
Superultramodern Ethical / Aesthetical Relativism (SEAR)
According to Superultramodern Ethical/Aesthetical Relativism (SEAR) nothing is absolutely good or bad (or beautiful or ugly), but, as Shakespeare said, thinking makes it so. The novelty in SEAR is its foundations. A thinks C (say an idea) is good...
Webcams: Science Fiction Communication at Home
One of the most incredible inventions I’ve ever come across is the web cam and its process of video conferencing. This is just so futuristic I can’t believe they really exist and are readily available to anyone with the Internet, speakers, and the...
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How strange! The sky is blue!
Look up! Just do it. What do you see? Stupid question, eh? You see the ceiling of course. When you look upwards during a sunny day while picnicking however, you see the blue sky. Ever wondered why the sky is not green nor but blue?
Before answering this question, let’s go back to the 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 called the electromagnetic spectrum. Electromagnetic waves travel through space at an amazing 300 00km/s. Therefore this is also the speed of light.
When you see white light from the bulb, you are actually seeing the seven colours of the 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 is the distance between the crests of the waves. The frequency is the number of waves that pass by each second. Note that the longer the wavelength, the lower the frequency and the 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 of the sky is due to an effect known as the Rayleigh scattering. As light from the sun moves towards Earth’s atmosphere, not all the colours are actually able to pass through that atmosphere. Most of the longer wavelength colours do pass (red, orange and yellow for sure) but
the shorter wavelength ones however are mostly absorbed by gas molecules found in the atmosphere. Absorbed blue light is then bounced back (radiated would be a better word) in all directions. This makes the shy to appear blue!
You would however ask me why it’s the blue rays, which get scattered, and not the indigo nor the violet rays (the other colours pass through the atmosphere remember – there’s also blue that pass through but it then gets scattered). Well in fact, the shorter the wavelength, the more the colour gets scattered. Violet, which has the shortest wavelength of all colours of the rainbow thus gets scattered more than blue rays do. Our eyes however are much more sensitive to blue than to violet and the sky therefore doesn’t appear to be violet but blue (in reality the sky is violet-indigo!).
Now do take the time making the following:
Take a look at the horizon (if you’re at the seaside) and note the sky’s colour there. No, it’s not as blue as the rest of the sky, is it? It’s much paler. This is because for the blue light to reach your eye, it has to travel more. Blue light will thus pass through more air consequently getting scattered more. Conclusion: less blue light reaches your eyes than compared to blue light from just above you.
About the Author
K.A.Cassimally is the editor in chief of Astronomy Journal and Astronomy Journal Ezine. He is also the co-founder of the RCPL Astronomy Club. K.A.Cassimally is best known for his article 'Harry Potter and the Moons of Jupiter'.
He is also Senior Columnist at BackWash.com where he writes 'Not Scientific Science'.
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