Express the following measurements in their S.I units (3) a) A speedometer measures 220 km h-1 . b) Alpha Centauri is 4.367 light years away from earth. c) Size of a hair strand is 181 m. d) A strand of human DNA is 2.5 nanometres in diameter. e) One molecule of water (H2O) would weigh 18.02 a.m.u. f) Wavelength of red light is 7500 Å.
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