1.

Assertion : Absorption spectrum consistsof some bright lines separated by dark spaces . Reason : Emission spectrum consists of dark lines.

Answer»

If both the ASSERTION and reason are true ANDREASON is correct explanation of the assertion .
If both the assertion and reason are true but reason is not a correct explanation of the assertion .
If the assertion is true but the reason is false.
If both assertion and reason are false.

Solution :Absorption spectrum is produced when white light is passed through a substanceand transmitted light is analysed by a spectrograph .Thedark spacescorresponds to the light RADIATION absorbed by the substance . And emission spectrum is produced by ANALYSING the radiant energy emitted by an excited substance by a spectrograph . Thus discontinuous spectra consistingof a series of sharp LINES and separated by darkbands are obtained.


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