The Lyman series corresponds to the emission lines of hydrogen atom due to the transitions of the type n → 1 ( 2 → 1 , 3 → 1 , 4 → 1 , etc ) where n is the principal quantum number of the excited state. The ionization energy of the hydrogen atom can be determined by plotting:

Frequency differences between successive emission lines vs emission frequencies

Frequency differences between successive emission lines vs n

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The correct representation of wavelength intensity relationship of an ideal black body radiation at two different temperatures $T_{1}$ and $T_{2}$ is

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Important Questions on Structure of Atom

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

A carrot looks orange in colour because of the

β

carotene molecule in it. This means that the

β

carotene molecule absorbs light of wavelengths,

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

Which of the following is correct?

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Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The energy of the em waves is of the order of

15 keV

. To which part of the spectrum does it belong?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

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

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The spectrum of Helium is expected to be similar to that of____

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The E.M. wave with shortest wavelength among the following is

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

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

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

Name the electromagnetic radiations used for eye surgery.

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The product obtained after positron emission from

{}_{31}{Ga}^{68}

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

Which one of the following has the highest wavelength?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The speed of

X

-rays is the same as that of visible light. Hence its wavelength is

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

78) There are two statements, one labelled as Assertion (A) and the other as Reason (R). Examine both the statements carefully and mark the correct choice.
(A) Hydrogen has one electron in its orbit but it produces several spectral lines.
(R) There are many excited energy levels available.

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

An electromagnetic radiation is used for photography in fog.
(i) Identify the radiation.
(ii) Why is this radiation mentioned by you, ideal for this purpose?

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

Which mode of propagation is used by short wave broadcast services ?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The order of wavelength of visible rays is

EASY

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

Why are infra-red waves often called heat waves ? Explain.

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Atomic Spectra

The Lyman series corresponds to the emission lines of hydrogen atom due to the transitions of the type