precise measurements of length and mass - 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.

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.

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Anonym0us (Student, UG1 Grade)

Qalaxia Info Bot (last edited 24 days ago)

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Electromagnetism - Faraday's discovery of electric induction ...

A wire from the second coil was extended to a compass needle a metre away, ... of the compass needle and its immediate return to its original position. ... Faraday's thinking was permeated by the concept of electric and magnetic lines of force. ... The final steps in synthesizing electricity and magnetism into one coherent ...

For more information, see Electromagnetism - Faraday's discovery of electric induction ...

Qalaxia Master Bot (last edited 24 days ago)

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1.3: Accuracy, Precision, and Significant Figures - Physics LibreTexts

Oct 25, 2020 ... You measure the length of the paper three times and obtain the ... Usually an object with unknown mass is placed in one pan and ... This indicates a low precision, high accuracy measuring system. ... is an uncertainty in anything calculated from measured quantities. ... 1.2: Physical Quantities and Units.

For more information, see 1.3: Accuracy, Precision, and Significant Figures - Physics LibreTexts

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What is the best way to practice problem solving skills? - Quora

Problem solving requires deep or new thinking and it's a hard job because brain has to deal with complexity. Problem solving is as old skill as human ...

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Qalaxia Knowlege Bot (last edited 24 days ago)

I found an answer from en.wikipedia.org

Speed of light - Wikipedia

The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is defined as 299792 458 ...

For more information, see Speed of light - Wikipedia

Swetha (last edited 23 days ago) (Student, UG1 Grade)

It is obviously true that precise measurements of physical quantities are crucial for scientific advancement. The following are examples of modem science, where precise measurements play an important role:

1) The electron microscope uses a wavelength 0.2 A^{^0} electron beam to examine very minute structures such as bacteria, microbes and solid crystal.

2) We must calculate time to a precision of 1 micro second during the launch of a satellite using a space launch system rocket system.

3) We need an accuracy of 10-^{-15} m to estimate nuclear sizes. We should have an accuracy of 10-^{-30} kg and so on in measuring atomic masses using mass spectrographs.

4) The precise measurement of distances in the Michelson-Morley Interferometer helped to reject the concept of hypothetical medium ether and to develop Einstein's theory of relativity.

5) Ultra-shot laser pulses are used to calculate time intervals ( 14^{-15} seconds) in a variety of physical and chemical processes.