When element has a Kα X-ray line whose wavelength is 0.180 nm?

(1) Cobalt             (2) Xenon          (3) Copper             (4) Iron

Concept Questions :-

Spectral series
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Atoms having different atomic number as well as different mass number but having same number of neutrons 

1. isotopes                          2. isobars

3. isotones                          4. isodiaphers

Concept Questions :-

Various atomic model
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Calculate the highest frequency of the emitted photon in the Paschen series of spectral lines of the Hydrogen atom:

(1) 3.7×1014 Hz                 (2) 9.1×1015 Hz

(3) 10.23×1014 Hz            (4) 29.7×1015 Hz

Concept Questions :-

Spectral series
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The energy of 24.6 eV is required to remove one of the electrons from a neutral helium atom. The energy in (eV) required to remove both the electrons from a neutral helium atom is:

1.  38.2

2.  49.2

3.  51.8

4.  79.0

Concept Questions :-

Bohr's model of atom
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The wavelength of radiation emitted is λ0 when an electron jumps from the third to the second orbit of hydrogen atom. For the electron jump from the fourth to the second orbit of the hydrogen atom, the wavelength of radiation emitted will be

(a) 1625λ0                               (b) 2027λ0

(c) 2720λ0                               (d) 2516λ0

Concept Questions :-

Bohr's model of atom
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Which of the following transitions gives photon of maximum energy?

(1) n = 1 to n = 2                (2) n = 2 to n = 1

(3) n = 2 to n = 6                (4) n = 6 to n = 2

Concept Questions :-

Bohr's model of atom
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The ratio of the longest to shortest wavelengths in Lyman series of hydrogen spectra is [EAMCET (Med.) 2000; BCECE 2006; J & K CET 2006]

(1) 259            (2) 176         (3) 95          (4) 43

Concept Questions :-

Spectral series
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Hydrogen atoms are excited from ground state of the principal quantum number 4. Then, the number of spectral lines observed will be

(a) 3                                     (b) 6

(c) 5                                     (d) 2

Concept Questions :-

Spectral series
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When electron jumps from n = 4 to n = 2 orbit, we get [2000]

(1) second line of Lyman series

(2) second line of Balmer series

(3) second line of Paschen series

(4) an absorption line of Balmer series

Concept Questions :-

Spectral series
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The spectrum obtained from a sodium vapour lamp is an example of

(a) band spectrum

(b) continuous spectrum

(c) emission spectrum

(d) absorption spectrum

Concept Questions :-

Spectral series
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