Class 11th
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New answer posted
7 months agoContributor-Level 10
Since ordinary white light consists of waves with all the wavelengths in the visible range, a ray of white light is spread out into a series of coloured bands called spectrum. The light of red colour which has the longest wavelength is deviated the least while the violet light, which has the shortest wavelength, is deviated the most.
The spectrum of white light, that we can see, ranges from violet at 7.50 * 1014 Hz to red at
4*1014 Hz. Such a spectrum is called a continuous spectrum (Continuous because violet merges into blue, blue into green and so on). A similar spectrum is produced when a rainbow forms in the sky.
The emission spectra
New answer posted
7 months agoContributor-Level 10
An ideal body, which emits and absorbs radiations of all frequencies uniformly, is called a black body and the radiation emitted by such a body is called black body radiation. In practice, no such body exists. Carbon black approximates fairly closely to black body. A good physical approximation to a black body is a cavity with a tiny hole, which has no other opening. Any ray entering the hole will be reflected by the cavity walls and will be eventually absorbed by the walls.
New answer posted
7 months agoContributor-Level 10
Werner Heisenberg a German physicist in 1927, stated uncertainty principle which is the consequence of dual behaviour of matter and. It states that it is impossible to determine simultaneously, the exact position and exact momentum (or velocity) of an electron.
It rules out existence of definite paths or trajectories of electrons and other similar particles.
New answer posted
7 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
(ii) R–Cl< RBr < RI
The reduction of alkyl halides depends upon the C-X bond strength i.e. lesser the bond strength higher will be the reactivity of alkyl halide. As down the group size of the halogens increases thus the bond strength decreases.
New answer posted
7 months agoContributor-Level 10
The chemical properties of an atom are controlled by the number of electrons in the atom, which remains the same despite the change or variation in atomic masses in case the of isotopes.
New answer posted
7 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
(i) I2< Br2< Cl2< F2
The reactivity of halogens with alkanes depends on the electronegativity i.e. higher the electronegativity higher would be the reaction. As down the group reactivity decrease so thus its reactivity.
New answer posted
7 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
(iv) C > B > D > A
The boiling point increases with the increase in the length of the side chain. However, with the branching, the boiling point decreases due to the decrease in the surface area.
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