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प्रश्न
State two uses of ultraviolet radiation.
उत्तर
(i) In producing vitamin D in plants.
(ii) For sterilizing purposes.
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संबंधित प्रश्न
Define the term dispersion of white light.
Describe how you could demonstrate that white light is composed of a number of colours.
What is a rainbow? What are the two conditions necessary for the formation of a rainbow in the sky?
Name the process which is involved in the formation of a rainbow.
The wavelengths of violet and red light are 4000 Å and 8000 Å respectively. Which of the two has the higher frequency?
Sunlight entering through a narrow aperture falls on a prism. Draw a neat labelled ray diagram to show the formation of the spectrum on a screen. Name the colour obtained nearer the base of the prism.
Match the Columns:
| Column ‘A’ | Column ‘B’ |
| The wavelength of red light | (a) 600 nm |
| (b) 700 nm | |
| (c) 500 nm |
Observe the given figure and write appropriate phenomenon of light in the box.
During dispersion of white light by prism placed in air, for a particular value of angle of prism,
In the following diagram showing dispersion of white light by a glass prism, the colours 'P' and 'Q’ respectively are:
