PHYSICS - FACTS TO REMEMBER

PHYSICS - FACTS TO REMEMBER
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*** speed of light is maximum in vaccum.
*** longitudinal waves can't be polarized.
*** Rainbow are always formed in direction opposite to the sun.
*** The frequency of visible light varies between 400 nm to 700 nm.
*** Colour blindness was first discovered by Homer (1976).
*** Focal distance of lens is maximum for red light and minimum for violet light.
*** 3-D IMAGE is known as HOLOGRAM.
*** If a transparent material is invisible in any liquid, then both of them have the same refractive index.
*** magnifying glass is convex lens of small focal lengths
*** Human eyes have CONVEX LENS.
*** Raman effect is related to SCATTERING.
*** OPTICAL FIBRES work on the principle of total internal reflection.
*** Hypo or radium thiosulphate is used for fusing in photography.
*** Power of sunglass is ZERO.
*** Heat energy are transmitted as infrared rays.
*** Air bubble in water behaves as CONCAVE LENS.
*** As temperature of medium increases, its refractive index increases.
*** BOLOMETER is used for detection of infrared rays.
*** AMMONIA is used as a coolant in refrigerator.
*** Clouds are flying due to their least density and viscosity of air.
*** The shape of raindrop is spherical due to SURFACE TENSION.
*** MICA is a common insulator in electric industries.
*** TUNGSTEN has the highest boiling point of all the elements. Hence, it is used for filaments in electric .
*** TRANSFORMERS and GENERATORS work on the principle of electromagnetic induction.
***  URANIUM OXIDE is known as YELLOW CAKE.
*** POLONIUM is first human made element.
*** The scientific study of sound and sound waves is termed as ACOUSTICS.
*** The average range of audible frequencies to which the human ear responds is between 20 Hz to 20,000 Hz.
*** Below 20 Hz frequencies are too slow for the human ear called infrasonic vibrations. such vibrations are produced during earthquakes.
*** sparkling of diamonds and formatjon of mirage take place due to TOTAL INTERNAL REFLECTION.
*** The bulb is filled with a mixture of NITROGEN and ARGON gases at very low pressure.
*** Floatation and swimming in sea water is easier than in fresh water, because density of sea water is more than fresh water. The sea water provides greater UPTHRUST as compared to the fresh water.
*** HYDROMETER is used for measuring the densities of liquids directly.
*** DACTYLOLOGY is the study of FINGERPRINTS.
*** CETOLOGY is the study of AQUATIC ANIMALS.
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DON'T LEARN ,,,,JUST READ ONCE...
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