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4 public questions tagged with this topic.

Energy, Intensity and Momentum of EM Waves

What is one technological importance of electromagnetic waves mentioned in the document?

**Energy in EM wave** equally divided between electric and magnetic fields, energy density u = ½ ε₀ E² + B²/(2μ₀) = ε₀ E² = B²/μ₀, average u_avg = ½ ε₀ E₀², intensity I = c u_avg = ½ c ε₀ E₀² = E₀ B₀/(2μ₀) = c B₀²/(2μ₀), radiation pressure p = I/c for absorption, 2I/c for reflection. The document highlights that electromagnetic waves can carry energy, enabling technologies like radio and TV signals for broadcasting. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields They carry energy for communication, illustrating EM wave transverse nature and Ma

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

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Infrared, Visible Light and Applications

What explains the effectiveness of infrared waves in remote sensing applications?

**Infrared waves** λ≈700 nm to 1 mm, f≈10¹² to 4×10¹⁴ Hz, produced by hot bodies and molecular vibrations, wavelength range as per document 700 nm-1 mm, used in remote sensing because IR penetrates haze, thermal imaging detects IR emitted by objects, remote controls, effective for sensing temperature. Infrared waves interact with materials based on their temperature and composition, allowing remote sensing devices to detect variations in heat signatures or material properties. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields Thermal interaction,

Ref: NCERT > Physics Book > Electromagnetic Waves > Infrared, Visible Light and Applications

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Plant tissue culture 3

Hairy root cultures are mainly used for:

Differentiated roots possess endodermis, pericycle, and organized transport tissues that compartmentalize biosynthetic pathways and sequester toxic end products safely in vacuoles. Hairy root cultures preserve this organization while displaying exponential growth in hormone-free liquid, combining advantages of organized tissue and microbial-like scalability. Many pharmaceuticals like atropine, scopolamine, withanolides, and tanshinones are synthesized primarily in root cortex and stored in vacuoles, so root cultures maintain expression of pathway genes including putrescine N-methyltransferase

Ref: Guillon Curr Opin Plant Biol 2006 metabolites; Srivastava Biotechnol Adv 2007; NCBI PMC3644105 hairy root factories; PubMed 17270743.

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