ICSE /Class 10
Physics MCQ Based On Using a triangular prism to produce a visible spectrum from white light electromagnetic spectrum
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ICSE Class 10 Physics Using a triangular prism to produce a visible spectrum from white light electromagnetic spectrum
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At the time of sunrise and sunset, light from the sun has to travel the longest distance of atmosphere to reach the observer. Since blue colour of it is lost, while the red light of long wavelength is scattered a little, so it is not much lost. Thus, blue light is almost absent in the sunlight reaching the observer and only red light reaches us.
Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.
Colour's speed is maximum in a glass.
Heated metal can produce infrared radiations.
Hershell discovered the infrared waves.
Microwaves are produced by electronic devices such as crystal oscillators.
Wavelength of Gamma rays is shorter than 0.1 â„« Angstrom
Newton discovered the Visible light.
f=c/λ=(3×〖10〗^8)/(800× ã€–10〗^(-9) )=3.75×〖10〗^14 Hz.
Marconi discovered the Radio waves.
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