Chapter 1: Measurement

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Chapter 1: Measurement

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The problem with this definition is that the length of the day is not constant as is shown in the figure. For this reason since 1967 the second is defined as the time taken by 9192631770 light oscillations of a particular wavelength emitted by a cesium-133 atom. This definition is so precise that it would take two cesium clocks 6000 years before their readings would differ more than 1 second.

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toán học
phương pháp vecto
đại số tuyến tính
hình học
nhị thức Nuiton

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