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As Above, SO Below
As Above, SO Below: The ‘As Above, So Below’ law that is the combination of micro and macrocosmic reality likely comes from Hermes Trismegistus, a Babylonian who became a Pharaoh of Egypt according to the Arab Encyclopedia. Barrett is probably...
Joseph Campbell
At the start of the US involvement in WWII Joseph Campbell was put in the position of having to defend culture and truth rather than go along with the crazed nationalism and outright invasion of so many public institutions through all manner of...
On Empathy - Part I
The Encyclopaedia Britannica (1999 edition) defines empathy as: "The ability to imagine oneself in anther's place and understand the other's feelings, desires, ideas, and actions. It is a term coined in the early 20th century, equivalent to the...
The Narcissist in the Workplace
Question: The narcissist turns the workplace into a duplicitous hell. What to do? Answer: To a narcissistic employer, the members of his "staff" are Secondary Sources of Narcissistic Supply. Their role is to accumulate the supply (remember events...
"WE DON'T know what we are talking about" - Nobel Laureate David Gross
Science has reached an enormous impasse. From biology to
physics, astronomy to genetics, the scientific community is
reaching the limits of understanding which often presage a
complete rethinking of long-accepted theories. So characteristic
of...
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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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