#remote sensing

Infrared, Visible Light and Applications

Why are infrared detectors used in Earth satellites?

**IR effectiveness in remote sensing** because IR scattered less than visible by atmosphere, can detect heat signatures, used in satellite imaging for vegetation, moisture, military night vision, illustrating application based on thermal emission and low scattering. Infrared detectors are used for military purposes and to observe crop growth, as stated in the document. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields For military purposes and crop observation, illustrating EM wave transverse nature and Maxwell's displacement current concept.

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

View Details

Infrared, Visible Light and Applications

Why are infrared waves often associated with thermal imaging?

**IR effectiveness in remote sensing** because IR scattered less than visible by atmosphere, can detect heat signatures, used in satellite imaging for vegetation, moisture, military night vision, illustrating application based on thermal emission and low scattering. Infrared waves are emitted by objects based on their temperature, and detectors can sense these emissions to map temperature variations, making them ideal for thermal imaging. Using c = fλ, E₀/B₀ = c, I_d = ε₀ dΦ_E/dt, and spectrum classification λ = c/f, evaluation yields Temperature-dependent emission, illustrating EM wave transv

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

View Details

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

View Details

Radioisopes and Field Biology methods

What is the main principle of NDVI?

Healthy green foliage strongly absorbs red light about 660 nm because chlorophyll pigments capture it for photosynthesis, while mesophyll cell structure highly reflects near-infrared around 800 to 850 nm. Normalized Difference Vegetation Index exploits this contrast by formula NIR minus RED divided by NIR plus RED, yielding values between minus one and one. Dense vegetation gives high positive values near zero point nine, bare soil near zero, water negative. Red-green ratio lacks physiological basis, and gamma absorption relates to nuclear physics. NIR-RED normalization corrects illumination v

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.

View Details