A photon of wavelength 300 nm causes the emission of two photons. If the wavelength of one of them is 700 nm. What is the wavelength of the other photon?

(A) 525 mm

(B) 600 nm

(C) 450 nm

(D) 300 nm

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High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Which transition of electron in the hydrogen atom emits maximum energy:

(A) 2 $\to$ 1

(B) 1 $\to$ 4

(C) 4 $\to$ 3

(D) 3 $\to$ 2

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Hydrogen Spectra
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

(A)H

(B)Li+

(C) Na

(D) He+

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Hydrogen Spectra
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Difficulty Level:

Frequency ratio between violet (400nm) and red (750nm) radiations in the visible spectrum, is-

(A) 8/15

(B) 4/15

(C) 15/8

(D) None of these

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High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The Compton wavelength for an electron is , calculate $∆\lambda$(1- cos θ) for a scattering angle  θ = $\mathrm{\pi }$/3. What is the maximum value for $∆\lambda$ ?

(A) 0.024 Å, 0.048 Å

(B) 0.012 Å, 0.048 Å

(C)0.012 Å, 0.024 Å

(D) 0.006 Å, 0.012 Å

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High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The minimum value of spin multiplicity possible, when $\mathcal{l}$=3, are

(A) 2

(B) 1

(C) 0

(D) 3

Concept Questions :-

Quantum Numbers
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Positronium is an unstable complex of electron and positron, both of the same mass, but opposite charge. Apply Bohr's theory of hydrogen atom to this system and obtain the energy required to separate the electron from the positron.

(ionization energy of the ground state hydrogen atom= 13.62eV.) Express the result in KJmol-1

(A) 550 KJmol-1

(B) 657 KJmol-1

(C) 851 KJmol-1

(D) 720 KJmol-1

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Bohr
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Difficulty Level:

The total spin resulting from a d7 configuration is -

(A) 3/2

(B) 1/2

(C) 2

(D) 1

Concept Questions :-

Quantum Numbers
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Difficulty Level:

Supposing the energy of fourth shell for hydrogen atom is -50a.u. (Arbitrary unit). What would be its ionization potential-

(A) 50

(B) 800

(C) 15.4

(D) 20.8

Concept Questions :-

Bohr
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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 -

(A) 0.25

(B)33.3

(C)66.6

(D)75

Concept Questions :-

introduction