मात्रक और मापन | Physics NEET 2023 Preparation✅Units And Measurements | Matrak aur Mapan

भौतिक राशियाँ (Physical Quantities)|मापन के मात्रक (Units of Measurement)|मूल मात्रक और व्युत्पन्न मात्रक (Fundamental and Derived Units)|मात्रकों की पद्धतियाँ (Systems of Units)|One Minute Revision

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$ Protoplasm is the physical basis of a cell. ! Angstrom is a unit of measurements of electron microscopy.

Measurements|| Physical Quantities|| Units|| Properties OF standard Unit

Assertion : A physical quantity which has zero dimension may have unit of measurement. Reason : Two physical entities having same dimensional formula may have different units of measurement.

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Solve the following crossword using the given clues: ACROSS 3. Principle relating to the apparent weight of a body when immersed in water. 6. Pressure caused by the weight of the air 7. Forces that require physical contact between objects 10. The force that exists between two magnets. 11. Unit of force 12. The resistance to movement that occurs when two bodies are in contact 13. The state when aperson does not feel any sensation of weight. DOWN 1. The pull of the earth 2. SI unit of pressure 4. Measure of the amount of matter in a physical body 5. The upward force that a fluid exerts on an object that is immersed in the fluid. 8. The force with which the earth pulls a body towards its centre. 9. Something that tends to cause movement of a body.

Photometry: The measurement of light as perceived by human eye is called photometry. Photometry is measurement of a physiological phenomenon, being the stimulus of light as received by the human eye, transmitted by the optic nerves and analysed by the brain. The main physical quantities in photometry are (i) the luminous intensity of the source, (ii) the luminous flux or flow of light from the source and (iii) illuminance of the surface. The SI unit of luminous intensity (I) is candela (cd). The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 xx 10^12 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian. If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted solid angle is one lumen (1m). A standa o incandescent light bulb emits approximately 1700 lumens. Unit of luminous flux is: