Visible Spectrum

The limits of the visible spectrum are 4000Å to 7000Å. Show that the violet of the thrid order visible spectrum overlaps the red of the second order spectrum produced by a plane diffraction grating having 15,000 lines per inch, when visible light is incident normally on the granting.

A pigment appears yellow-orange in the chromatogram and found in leaves of higher plants, helps (a) In absorption of light of different wavelength (b) To prevent oxidative destruction of chlorophyll pigment by light. (c) By absorbing wavelengths beyond visible spectrum which increases the efficiency of photosynthesis.

A double slit of separation 0.1 mm is illuminated by white light. A coloured interference pattern is formed on a screen 100 cm away. If a pin hole is located in this screen at a distance of 2 mm from the central fringe, the wavelength in the visible spectrum (4000 Å to 7000Å) which will be absent in the light transmitted through the pin hole is (are)

Read the following statements and select the correct ones. (i) All the colour components of the visible spectrum are available for marine plants living in different depths of the ocean. (ii) Many herbs and shurbs in rainforests adapt to photosynthesise optimally under very low light conditions as they grow under canopy trees (iii) Gradual increas in average global temperature will affect the distributional range of some species. (iv) The quality of soil does not depend upon the weathering process.

Statement I: A beam of white light enters the curved surface of a semicircular piece of glass along the normal. The imcoming beam is moved clockwise (so that the angle theta increases), such that the beam always enters along th enormal to the curved side. Just before the refracted beam disappears, it becomes predominantly red. Statement II: The index of refraction for light at the red end of the visible spectrum is more than at the violet end.

Emission And Absorption Spectrum|Emission Spectrum|Continous Spectrum|Line Spectrum|Absorption Spectrum|Difference Between Emission And Absorption Spectrum|Emission Spectrum Of Hydrogen|Rydberg Formula|Questions|Summary

The emission spectrum of hydrogen in the visible consists of :

Exercise Questions|Intensity|Photocurrent|Note|Exercise Questions|Emission And Absorption Spectrum|Continuous Spectrum|Emission Spectrum|Line Spectrum|Absorption Spectrum|Summary