Explanation:
A lactometer is a specific type of hydrometer used to test the purity of milk by measuring its relative density. All hydrometers, including lactometers, work on Archimedes' Principle of buoyancy. They float at a depth that depends directly on the density of the liquid; they sink deeper in less dense liquids (like milk heavily diluted with water).
Explanation:
Polarization requires transverse waves. Sound in air is longitudinal (oscillations ∥ propagation) ⇒ cannot be polarized. EM waves (light, radio, X-rays) are transverse ⇒ can be polarized. Memory tip: 'Polarization ⇒ transverse only; sound = longitudinal ⇒ no polarization'. Wave property frequently tested in competitive exams.
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