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Introduction to CFT

What are the ...

Question

What are the dark lines seen in the solar spectrum called?

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Solution

Dark lines of solar spectrum are called Fraunhofer lines.

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Q. Assertion (A) : The dark lines in solar spectrum are called Fraunhofer lines.
Reason (R) : The elements in the chromosphere of the Sun absorb the light of their characteristic wavelengths coming from its photosphere.

Q. The block lines in the solar spectrum during solar eclipse can be explained by

Q. At the time of total solar eclipse, Fraunhofer lines in solar spectrum appear as:

Q. Match the following :

List - 1	List - 2
a) Burning candle	e) line spectrum
b) Sodium vapour	f) continuous spectrum
c) Bunsen flame	g) bond spectrum
g) Dark lines in solar spectrum	h) Absorption spectrum

Q. Like the solar spectrum the spectra of stars show a continuous spectrum on which dark aborption lines are superimposed. The inner layer (called the photosphere) of the star emits radiations of all wavelengthts, producing a continuous spectrum. When these radiations pass through the outer, relatively cooler, layer of the star, the radiations of certain wavelengths are selectively absorbed by this layer. This explains the dark lines in the spectrum of a star. The dark lines are charactreristic of the substances present in the outer layer of the star.The surface temperature T of a star can be estimated by measuring the wavelengths

λ_{m}

at which the intensity of the emitted radiation is maximum and then using Wiens displacement law which states that

λ_{m}

=

b where b is a constant called Wiens constant and the above relation is called Wiens Displacement Law which states that as the temperature increases, the maximum intensity of emission shifts (or is displaced) towards the shorter wavelengths. The value of constant b has been found experimentally to be 2.89 x 10

^{- 3}

mK .
The dark lines in the solar spectrum are due to the

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