13 public questions tagged with this topic.
ΔE = 108.8 eV. λ ≈ 11.42 nm.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Shapes of Orbitals - s p d f and Nodes and Radial Probability
λ = hc/E = 400 nm.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Quantum Mechanical Model - de Broglie Heisenberg and Schrodinger
Brackett: n₁=4, n₂=8. λ = 4858 nm.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Quantum Mechanical Model - de Broglie Heisenberg and Schrodinger
E = hc/λ ≈ 4.970×10⁻¹⁹ J. W₀ = E - KE ≈ 3.470×10⁻¹⁹ J.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Electronic Configuration - Aufbau Pauli Hund and Stability
Pfund series: n₁=5, fifth line n₂=10. ν̄ = 1.097×10⁷ (1/25 - 1/100) = 3.291×10⁵ m⁻¹. λ = 1/ν̄ = 3.039×10⁻⁶ m = 3039 nm.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Electronic Configuration - Aufbau Pauli Hund and Stability
Paschen: n₁=3, n₂=4. λ = 1876 nm.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Discovery of Subatomic Particles - Electron Proton Neutron
λ = h/(mv) = 3.64×10⁻¹⁰ m.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Atomic Models - Thomson Rutherford and Bohr Model
λ = h/(mv) ≈ 3.966×10⁻¹³ m.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Atomic Models - Thomson Rutherford and Bohr Model
UV-VIS spectral shifts describe changes in λmax position and intensity due to solvent polarity, pH, conjugation length or auxochrome substitution. Bathochromic shift, also termed red shift, denotes movement of absorption maximum toward longer wavelength, lower frequency and lower energy. It originates from extension of conjugation, addition of electron-donating groups, or increased polarity stabilizing excited state more than ground state. For example, deprotonation of phenol to phenolate shows bathochromic movement. Recognition of this terminology helps interpret protein chromophore environment changes, drug binding and structural alterations in conjugated biomolecules relevant to biochemistry laboratories.
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
Tryptophan fully exposed to water experiences maximal dipolar stabilization of its excited state. Solvent relaxation around excited indole lowers S1 energy, narrowing S1-S0 gap and shifting emission to about 350 to 355 nanometers. Buried residues in apolar core lack such stabilization, emitting near 308 to 335 nanometers. Tyrosine emits around 303 nanometers, distinct. Observing maximum near 350 nanometers therefore indicates surface, loop or unfolded region where water interacts freely. This wavelength criterion serves as benchmark for denaturation and solvent accessibility mapping.
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
Interplanar spacing calculation from diffraction geometry is performed directly via Bragg's law, nλ = 2d sinθ, rearranged to d = nλ / 2 sinθ. Experimental diffraction pattern supplies θ values for each reflection, X-ray wavelength λ is known from source calibration, enabling lattice parameter determination. Fourier transform later uses d and associated intensities to compute electron density, interference law generalizes wave superposition, and Planck relation E = hν links photon energy to frequency without giving spatial distances. Bragg's formulation therefore remains indispensable component for indexing reflections and solving crystal structures of biological macromolecules.
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
Bragg's law, nλ = 2d sinθ, mathematically describes constructive interference when monochromatic X-rays reflect from parallel planes of atoms within a crystal lattice. Incident wavelength λ is known from X-ray source, θ is experimentally measured diffraction angle between beam and crystal planes, n represents diffraction order. Rearranging yields d = nλ divided by 2 sinθ, giving spacing between lattice planes which directly corresponds to interatomic distances. Converting measured spot positions into real-space distances via this equation enables building electron density maps and ultimately three-dimensional models of macromolecular architecture.
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
