HARD
Earn 100

The correct representation of wavelength intensity relationship of an ideal black body radiation at two different temperatures and is
(a)

(b)

(c)

(d)


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Important Questions on Structure of Atom
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Consider the following
(i) Submarine communications
(ii) A.M. radio
(iii) Shortwave ratio
(iv) Radar
Arrange the above in increasing frequency of the waves associated with them

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The number of following statement/s which is/are incorrect is ______
A) Line emission spectra are used to study the electronic structure
B) The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet.
C) An absorption spectrum is like the photographic negative of an emission spectrum
D) The element helium was discovered in the sun by spectroscopic method

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Which one of the following has the highest wavelength?

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(A) Hydrogen has one electron in its orbit but it produces several spectral lines.
(R) There are many excited energy levels available.

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(i) Identify the radiation.
(ii) Why is this radiation mentioned by you, ideal for this purpose?

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