Amazing Facts

Light Facts




The speed of light is generally rounded down to 186,000 miles per
second. In exact terms it is 299,792,458 m/s (metres per second –
that is equal to 186, 287.49 miles per second).


It takes 8 minutes 17 seconds for light to travel from the Sun’s
surface to the Earth.


Every second around 100 lightning bolts strike the Earth.


Every year lightning kills 1000 people.


The currently accepted value is 299 792 km/s based on several
measurements.


Red, green and blue are the primary colours of light. Mixing them
in various ways will make all other colours, including white.


Light is a form of energy which our sense of sight can detect. It
is made of electro-magnetic radiation and travels in a straight
path.


The bending of light as it passes from one transparent substance
to another, like air to water, is called refraction.


When sunlight is intercepted by a drop of water in the
atmosphere, some of the light refracts into the drop, reflects
from the drop’s inner surface, and then refracts out of the drop.
The first refraction separates the sunlight into its component
colours, and the second refraction increases the separation. The
result is a rainbow.


There are different colours of light because they are light waves
which have different wavelengths. Red light has the longest
wavelength while violet light has the shortest wavelength.


The light bulb was invented in 1879 by Thomas Alva Edison.


When you turn on a light bulb only 10 per cent of the electricity
used is turned into light, the other 90 per cent is wasted as
heat.


Low energy light bulbs last on average up to 12 times longer than
traditional fluorescent bulbs.


Low energy light bulbs last on average up to 12 times longer than
traditional fluorescent bulbs.


A heavy coat of dust can block up to half of the light.





   
Related Tags: Light  Science  Energy  
 
Current Rating :
Rate this Mail :