The spectrum of He-atom may be considered similar to the spectrum of - 

1. H

2. Li+

3. Na

4. He+

Subtopic:  Hydrogen Spectra |
 75%
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The frequency ratio between violet (400nm) and red (750nm) radiations in the visible spectrum, is-

1. 8/15

2. 4/15

3. 15/8

4. None of these

Subtopic:  Electromagnetic Radiation |
 77%
From NCERT
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The Compton wavelength for an electron is  hm0c

0.024 Å 

calculate λhm0c(1- cos θ) for a scattering angle  θ = π/3. What is the maximum value for λ ?

1. 0.024 Å, 0.048 Å

2. 0.012 Å, 0.048 Å

3. 0.012 Å, 0.024 Å

4. 0.006 Å, 0.012 Å

Subtopic:  Electromagnetic Radiation |
 54%
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The total spin resulting for a 3d7 configuration is 

1. 3/2

2. 1/2

3. 2

4. 1

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 64%
From NCERT
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Supposing the energy of the fourth shell for the hydrogen atom is -50a.u. (Arbitrary unit). What would be its ionization potential-

1. 50

2. 800

3. 15.4

4. 20.8

Subtopic:  Bohr's Theory |
 51%
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An element with atomic mass Z consists of two isotopes of mass number Z-1 and Z + 2. The percentage abundance of the heavier isotope is -

1. 0.25

2. 33.3

3. 66.6

4. 75

Subtopic:  Introduction of Atomic Structure |
 62%
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Two isotopes of Boron are found in the nature with atomic weights 10.01(I) and 11.01(II). The atomic weight of natural Boron is 10.81. The percentage of (I) and (II) isotopes in it are respectively-

1. 20 and 80

2. 10 and 90

3. 15 and 75

4. 30 and 70

Subtopic:  Introduction of Atomic Structure |
 66%
From NCERT
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Calculate the wavenumber of lines having the frequency of 5 x 1016 cycles per sec. 

1. 1.666 x 108m-1 

2. 0.666 x 108m-1

3. 4.126 x 106m-1

4. 3.133 x 104m-1

Subtopic:  Electromagnetic Radiation |
 75%
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Which of the following set of quantum number is not valid

1. n = 1 , l = 2

2. n=2, m = 1

3. n =3, l = 0

4. n = 4, l = 2

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 87%
From NCERT
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For particles having same kinetic energy, the de Broglie wavelength is-

1. Directly proportional to its velocity

2. Inversely proportional to its velocity

3. Independent of velocity and mass

4. Unpredictable

Subtopic:  De Broglie Equation |
From NCERT
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