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प्रश्न
Name the radiation of a wavelength longer than 8 × 10−7 m.
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उत्तर
Infrared radiations.
संबंधित प्रश्न
Why is the colour red used as a sign of danger?
In following figure shows a thin beam of white light from a source S striking on one face of a prism.
Complete the diagram to show effect of prism on the beam and to show what is seen on the screen.
(i) Draw a diagram to show the splitting of white light by a prism into its constituent colour.
(ii) Draw another diagram to show how the colours of spectrum of white light can be combined
to give the effect of white light.
Write the approximate wavelengths for blue.
Give a reason, why the violet colour of white light deviated most and red colour of white light deviated least.
What is understood by the term dispersion of light? What is its cause?
A prism causes dispersion of white light while a rectangular glass block does not. Explain.
Draw a neat diagram to show the arrangement you would use to project a pure spectrum of white light on a screen.
Which colour of white light travels slowest, in glass?
Write the approximate wavelength for red light.
