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प्रश्न
State two uses of ultraviolet radiation.
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उत्तर
(i) In producing vitamin D in plants.
(ii) For sterilizing purposes.
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संबंधित प्रश्न
When a beam of white light is passed through a prism, it splits to form lights of seven colours. Is it possible to recombine the lights of seven colours to obtain the white light again? Explain your answer.
Out of the following, the colour of light having the maximum wavelength is:
(a) violet
(b) indigo
(c) green
(d) orange
The seven colours in the spectrum of sunlight in order, are represented as :
Which is optically denser: water or air? Give reason
Define the term dispersion of light.
The frequency range of visible light is from 3.75 × 1014 Hz to 7.5 × 1014 Hz. Calculate its wavelength range. Take speed of light = 3 × 108 m/s.
If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?
Answer the following:
What do you mean by dispersion? Name the different colours of light in the proper sequence in the spectrum of light.
What do you understand by spectrum? Name the seven prominent colours in order, as obtained in the spectrum of white light.
Say TRUE or FALSE
After passing through a prism, white light splits into a band of seven colours
