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प्रश्न
Define one kilogram, the S.I. unit of mass.
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उत्तर
One kilogram (kg) is the S.I. unit of mass. It is defined as the mass of the international prototype of the kilogram, which is a platinum-iridium alloy cylinder stored at the International Bureau of Weights and Measures in France.
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संबंधित प्रश्न
The unit of length convenient on the nuclear scale is a fermi : 1 f = 10– 15 m. Nuclear sizes obey roughly the following empirical relation : `r = r_0A^(1/3)` where r is the radius of the nucleus, A its mass number, and r0 is a constant equal to about, 1.2 f. Show that the rule implies that nuclear mass density is nearly constant for different nuclei. Estimate the mass density of sodium nucleus. Compare it with the average mass density of a sodium atom obtained in Exercise 2.27
Answer the following in short.
What do you understand by the term ‘mass’? Name any one instrument used for weighing.
Fill in the blank.
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The moon’s gravitational pull is one ______ of the earth’s pull.
Stop clock:: accurate time: _______:: accurate weight.
Mass is ______.
Mass is a ______ quantity.
Assertion (A): Mass, Length, and Time are fundamental physical quantities.
Reason (R): They are independent of each other.
Write a short note on the following:
Common (beam) balance:
Name the device used for measuring the mass of atoms and molecules.
