BharatNotes Stealth
noun; also attributive/adjective (as in "stealth aircraft", "stealth taxation")Usage in a UPSC answer
Critics argue that financing welfare schemes through fiscal drag and unindexed slabs amounts to taxation by stealth, eroding parliamentary accountability since the burden rises without any explicit vote in the legislature.
Synonyms
Antonyms
Word Family
stealthy (adj), stealthily (adv), stealthiness (n), stealthy (adj), stealth (n/attrib adj)
Root
Old English stǣlþ = theft, secret action; stelan = to steal; -th = abstract noun suffix
Etymology
From Middle English stelthe ("theft, secret action"), from Old English stǣlþ, related to stelan ("to steal"); the military-technology sense emerged in the 1980s as radar-evading aircraft design advanced.
Memory Hook
Hidden inside "stealth" is "steal" plus -th: to steal something requires moving in secret, undetected — stealth is the manner of the silent thief.
How This Word Works in UPSC Writing
The reduction of detectability rather than the achievement of invisibility, and stating that correctly is half the answer. The principal measure is radar cross-section, reduced by two independent means: shaping, so that incident radar energy is reflected away from the receiver rather than back towards it, which is why such aircraft have flat facets, aligned edges and no exposed engine faces or right-angled corners; and radar-absorbent materials that convert energy into heat. Infrared signature is managed separately by shielding and mixing the exhaust, and emissions are limited by operating passively. The limitations belong in any balanced answer: stealth is optimised against particular radar bands, and low-frequency radars can often detect that something is present even when they cannot generate a weapons-quality track; carrying weapons internally to preserve the shape reduces payload; and the coatings are maintenance-intensive. India's fifth-generation programme is the Advanced Medium Combat Aircraft, cleared by the Cabinet Committee on Security in March 2024 for full-scale engineering development.
Don’t Confuse It With
Stealth reduces the probability and range of detection rather than conferring invisibility, which is the commonest misunderstanding of the term. Radar cross-section measures how strongly an object returns radar energy to the receiver, and is reduced by shaping and by radar-absorbent material. Low observable is the more accurate technical description. Electronic countermeasures jam or deceive a radar instead of avoiding it, so they are an alternative rather than a component, and emission control is the discipline of not radiating detectable signals at all.
Hindi Meaning
प्रच्छन्न प्रौद्योगिकी (prachchhann praudyogikī) or स्टेल्थ.
Common Questions
- Does stealth make an aircraft invisible to radar?
- No. It reduces the range and probability of detection, and low-frequency radars can often tell that something is present even when they cannot produce a track good enough to guide a weapon.
- How is radar cross-section reduced?
- By shaping the airframe so radar energy reflects away from the receiver rather than back to it, and by coating surfaces with radar-absorbent materials that convert the energy to heat.
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