Precise measurements of phsysical quantites area need of science. For example, to accertain the speed of an aircraft, one must have an accurte method to find its positions at clsely separted 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.

Precise measurements of phsysical quantites area need of science. For

1.	Precise measurements of phsysical quantites area need of science. For example, to accertain the speed of an aircraft, one must have an accurte method to find its positions at clsely separted 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.
Answer» Preciese measurements of physcial quantites like length, mass and time are the primary requirements fro development fo quatitative laws of Physics or any other science. For example in the measurement of distance of moon form earth by Laser beam, very accurate measurement of time taken is required. Similoarly, for measuring distance, elevation and velocity of an aeroplane by Radar method, time measruement has to be accurate. For measurig distance of nearby stars, accurate measurement of parallax angle is required. in the field of crystallography, precise measurement of lenght is needed to determine interatomic distaances. Using a mass spectrometer. the precision measurement of masses of atoms are made.