Objects float if their density is less than the fluid. Cork density < water density, so it floats. Iron sinks because density > water. Ship made of iron floats due to shape displacing more water, average density less.
Explanation:
EM waves transverse: E ⊥ B ⊥ propagation direction. Derived from Maxwell's equations. Memory tip: 'EM wave: right-hand rule for E×B direction'. Wave property frequently tested in competitive modern physics sections.
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