Welcome to PhysLink.com - Your physics and astronomy online portal. Stay a while! Check out our extensive library of educational and reference materials. Also, check out our fun section!
Why does the red color appear at the horizon during sunset?
Asked by: Huma Naqvi
The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. There is a similar form of scattering called Mie scattering which is responsible for the white colour of clouds.
Particles in our atmosphere that are approximately the same size as the wavelength of visible light cause the white light from the sun to scatter and split into individual components. Oxygen and Nitrogen (the main components of our atmosphere) scatter violet and blue light due to their small size. This is why the sky appears to be blue in the day time, especially at midday when the Sun is closest to us.
During sunrise and sunset the distance that the light has to travel from the Sun to an observer is at its greatest. This means the a large amount of blue and violet light has been scattered so the light that is recieved by an observer is mostly of a longer wavelength and therefore appears to be read.
For more information try looking at http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/opt/mch/sct.rxml
Answered by: Edward Rayne, Physics Undergraduate Student, Cambridge UK
Fireflies In My Room
Today's Price: $19.00
Light up your room with magical fireflies with this great set! Buy it now! Deal ends at midnight!
Here are our physics & astronomy bestsellers:
Solar Science Kit
Mini Plasma Ball
Deluxe 3D Mirascope
Deluxe Water Rocket Set
Revolving Multi-Color Fiberoptic Light
Magnetic Levitator - Classic
Ultimate Chemistry Set CHEM C3000 v2.0
Worlds Strongest Magnets
Solar System Planetarium 4M Kit
Blue Fiber Optic Light