Question 2.21 Precise measurements of physical quantities are a need of science. For example, to ascertain the speed of an aircraft, one must have an accurate method to find its positions at closely separated instants of time. This was the actual motivation behind the discovery of radar in World War II. Think of different examples in modern science where precise measurements of length, time, mass etc. are needed. Also, wherever you can, give a quantitative idea of the precision needed.
Chapter Units And Measurements Page 37
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Off - course precise measurement of physical quantities are needs of science. We read in class 9-10 about atom . Its size in angstrun unit e.g 10^-10 m , very precise measurement require for finding size atoms or subatomic particles .
Nuclear reaction , power plant or nuclear weapons are great examples of precise measurement . In reaction , time peroid or half life peroid is in the form of 10^-9 sec . Very precise. A big accident may be possible when we do little mistakes .
The development of mass spectroscopy used in finding of mass of atoms . Here , we can use precise measurement concept for finding mass of atom precisely.
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Off - course precise measurement of physical quantities are needs of science. We read in class 9-10 about atom . Its size in angstrun unit e.g 10^-10 m , very precise measurement require for finding size atoms or subatomic particles .
Nuclear reaction , power plant or nuclear weapons are great examples of precise measurement . In reaction , time peroid or half life peroid is in the form of 10^-9 sec . Very precise. A big accident may be possible when we do little mistakes .
The development of mass spectroscopy used in finding of mass of atoms . Here , we can use precise measurement concept for finding mass of atom precisely.
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