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Showing posts with label physics classes. Show all posts
Showing posts with label physics classes. Show all posts
Wednesday, 5 April 2017
What is light for all
What is Photon. Photon is define as, very very tiny (smallest) particle/packet of energy. The rest mass of photon is zero.
What is wave. Wave is define as, A wave can be described as a disturbance that travels through a medium from one location to another location.
Thomas Young's double-slit experiment shows that it also behaves as a wave.
Albert Einstein proved that in 1905, light could behave as a particle by showing that a beam of light could eject electrons from metal when a suitable radiation (invisible ray) fall on metal, This suggested that light consisted of photons that could eject electrons of similar frequency. Einstein's discovery altered the prevalent theory at the time, which held that light was only a wave.
And light has the wave nature also, it has proved earlier by Young in 1801. In his experiment, Young shone light between two parallel slits, causing the light waves to interfere with each other and form a patter of dark and light bands. If light was primarily a particle, it would have formed two parallel lines.
Tuesday, 28 March 2017
Sun radiation facts
The Sun Lights
The actual color of sun's light is white. When astronauts see the sun from space its look white.
Why its looks like white, because its light is not scattered by atmosphere.
And white color is mixture of seven colors called VIBGYOR.
But we can not see all color by our naked eyes, to watch VIBGYOR we will have to pass the sun's light through Prism or water's drops.
But there are some animals who can see all color of VIBGYOR as well as ultraviolet lights also with their naked eyes. e.g, honey bees can see ultraviolet lights, Pit viper can see infrared, Puppies, meanwhile can see into our heart, frogs can detect very sensitive photons.
Why leafs looks green, because leafs reflects only green color from VIBGYOR, and absorbed left all colors.
Pit viper snake
When light passing through a prism
Honey bee can also see U.V radiation
Rainbow
This frog can see U.V light
When sunlight passing through the prism
Water bubble with rainbow color
Friday, 24 March 2017
Physics lessons online for student
Lets know about Light.
Study of light is called optic.
Light travels in straight path
Light has electromagnetic energy.
Generally there are two type of light, (a) Visible light (b) Invisible light.
When we talk about visible light is known as light or optic. e.g, Sun light.
When we talk about invisible light is called electromagnetic radiation, e.g, ultraviolet radiation
Light is made by very tiny packets called photon.
Every photons contain lots of energy.
Speed of light changes with change of mediums (objects or materials).
Light
Light and its components
When light passing through the prism
Lets know about Shadows.
99.99% Space is dark (full of shadows).
Because there is no sufficient light, light is visible when it has an object in its path.
No one has seen the shadow of moon, sun, Jupiter, mars, earth, Venus etc in space.
There is no shadow of astronauts has found in moon.
In ancient time people was thinking about shadow formed by sun, thought lot and utilized this principle in making the world’s most primitive clocks, the sundials.
Light and shadow combination
shadow and light combination
Earth from space
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