A clock is used to measure time interval. An atomic standard of time is based on periodic vibration produced in a cesium atom. This is the basis of the cesium clock, sometimes called as atomic clock, used in the national standard. In the cesium atomic clock, the second is taken as the time needed for […]
Mass of a body is the quantity of matter in the body which does not depend on the temperature, pressure or location of the body in space. The prototypes of the international bureau of weights and measures (BIPM) are available in many other laboratories of different countries. In India, this is available at the national
JEE Main Physics 2023: 20 Years Chapter and Topic-Wise Solved Papers JEE Physics Best Study Materials PDF JEE Chemistry Best Study Materials PDF JEE Maths Best Study Materials PDF Also Read JEE Previous Year Solved Papers From this post all of you can download JEE Main Physics Previous Year Chapter Wise Questions from last 20
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A simple method for estimating the molecular size of oleic acid. Oleic acid is a soapy liquid with large molecular size of the order of 10⁻⁹ m. We dissolve 1 cm³ of oleic acid in alcohol to make a solution of 20 cm³, Then we take 1 cm³ of this solution and dilute it to
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(I) LASER Method The full form of LASER is light amplification by stimulation emission of radiation. The reflection method for measuring the distance of the moon is LASER method. Distance of the Moon from the Earth S = c×t/2 Where, c = Speed of light ( 3×10⁸ m/s), t = Time elapsed between the instants
The length may be defined as the distance of separation between two points in space. There are two methods for the measurement of length. 1. Direct Method In this method, measurement of length involves the uses of (I) Meter scale (From 10⁻³ m to 10² m). (II) Vernier callipers (Upto 10⁻⁴ m). (III) Screw gauge
For Length/Distance (I) Astronomical Unit It is the mean distance of the earth from the sun. 1 AU = 1.496×10¹¹ m (II) Light Year It is the distance travelled by light in vacuum in 1 year. 1 ly = 9.46×10¹⁵ m (III) Parallactic Second It is the distance at which an arc of length 1
The system of units which is accepted internationally for measurement is called international system of unit. The SI, with standard scheme of symbols, units and abbreviations was developed and recommended by General conference on weights and measures in 1971 for international uses in scientific, technical, industrial and commercial work. Some other common system of units
The standard amount of a physical quantity chosen to measure the physical quantity of the same kind is called a physical unit. The essential requirement of a physical unit are as- (I) It should be of suitable size. (II) It should be easily accessible. (III) It should not vary with time. (IV) It should be
All those quantities which can be measured directly or indirectly and in terms of which the law of Physics can be expressed are called physical quantities. Physical quantities can be further divided into two types. 1. Fundamental Quantities Those physical quantities which are independent of other physical quantities and are not defined in terms of
