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5 public questions tagged with this topic.

Energy, Intensity and Momentum of EM Waves

An electromagnetic wave in vacuum has an angular frequency \( \omega = 4 \times 10^{11} \, \text{rad/s} \). What is its

**Poynting vector** S = E×B/μ₀ gives energy flow (W/m²), magnitude S = E B/μ₀, average = E₀ B₀/(2μ₀) = intensity, direction of propagation, showing energy transport perpendicular to E and B. Frequency v = (ω/2π) . Given ω = 4 × 10¹¹ rad/s , v = (4 × 10¹¹/2 π) ≈ 6.37 × 10¹⁰ Hz . Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields 6.37 × 10¹⁰ Hz, illustrating EM wave transverse nature and Maxwell's displacement current concept.

Ref: NCERT > Physics Book > Electromagnetic Waves > Energy, Intensity and Momentum of EM Waves

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PHYSICS

What is the Fahrenheit equivalent of 50° C ?

Given: What is the Fahrenheit equivalent of 50° C ? These values define the system as per NCERT data. Formula: Relation: t_F = 9/5 t_C + 32. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: t_F = 9/5 × 50 + 32 = 90 + 32 = 122° F . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Physics Textbook for Class XI and XII, Chapter: Units and Measurements and Physical World, Topic: Dimensional analysis and fundamental principles.

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Sea urchin -lll

Cortical granules convert:

Unfertilized sea urchin egg vitelline membrane lies closely apposed to plasma membrane with little perivitelline space. Upon calcium-dependent cortical granule exocytosis, contents including hyalin, proteases, sulfated mucopolysaccharides, and ovoperoxidase are released. Proteases cleave linkers between vitelline membrane and plasma membrane, osmotic swelling by glycosaminoglycans elevates membrane outward, and cross-linking enzymes harden it via di-tyrosine bonds. Modified vitelline membrane becomes fertilization envelope raised above egg surface with perivitelline space between. This convers

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 7: Cortical granules convert vitelline membrane to fertilization envelope.

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Eukaryotes gene regulation

Conversion of Sep-tRNA Sec to Sec-tRNA Sec is by

O-phosphoseryl-tRNASec transformed to selenocysteinyl-tRNASec by SepSecS, also called Sec synthase SEPSECS, pyridoxal phosphate-dependent enzyme catalyzing beta-replacement reaction. Active site PLP forms internal aldimine with conserved lysine, transaldimination yields phosphoserine Schiff base, phosphate elimination facilitated by base creates aminoacrylate intermediate attacked by selenophosphate. Selenophosphate H2SePO3- synthesized by SPS2 serves as selenium donor, generating selenocysteine attached to tRNA ready for translation. SepSecS specifically recognizes tRNASec long variable arm,

Ref: Alberts et al., Molecular Biology of the Cell, 7th ed., Chapter 6: SepSecS Converts Sep-tRNASec to Sec

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