12P08

 12P08 Electro Magnetic Waves

Accidental discovery of Infrared waves

 Heinrich Hertz's Historical Experiment

 Hertz Experiment Demo using Induction Coil

Hertz Experiment on Electromagnetic Waves

Hertz and Radio Waves Explained, 
validating Maxwell's predictions

Electromagnetic Waves - with Sir Lawrence Bragg

Academo. Org 

Wavelength to Colour relationship

400 to 800 nm Visible Light Spectrum

Academo. Org 
Temperature to Colour relationship

As temperature of source increases the colour of radiation changes to higher frequency. Wein's displacement law and Stefan's Law.

 Mysteries of Light

I found this property very interesting and confusing. Light itself is invisible. We see light only when it falls on someother particles. 

We see the beam of head lights of car because of the dust and mist scattering the light.Colloidal solution. If there were no dust and mist we may not see much of the beam despite the air molecules. In vaccuum of the deep space there is no nothing to scatter the light, so the darkness. Dark sky of the moon too due to no atmosphere there to scatter the light as in earth.

So what we call it as visible light is actually invisible? 😊 

Visible when it strikes the retina of eye.