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Explain Light source - Pre-requisites of Colour Perception
No colour may be detected by the eyes or by an instrument in the dark i.e. in the absence of a light source emitting radiant energy in the visible range of the spectrum. Wrong results will be obtained if the light source is not emitting sufficient radiant energy at the critical wavelength. To avoid this, three standard illuminants i.e. light sources have been established by the International Commission of Illumination. These are:
Illuminant A i.e. Incandescent lamp (2844°K)
Illuminant B i.e. noon sunlight (4000°K)
Illuminant C i.e. cloudy daylight (6800°K)
Explain the Heat loss and Bacteriolytic action Heat loss - This is found in dog, sheep etc. Who do not have sweat glands? In very hot climate, they secrete more saliva (pant
what is the process of komodo dragon when reproducing by parthenogenesis
Availability of Nutrients: The nutrients in the upper layers of water are constantly being taken up by the phytoplankton, who are the producers, and then these pass on to th
A wound should be cleaned first and covered with a protective dressing. The main purpose of dressing is to: (1) prevent infection, (2) control bleeding, (3) absorb any dis
Causes of Fire : The potential fire risk arises from the presence of combustible solids, liquids or gases in conjunction with ignition sources. One or more class is generally fou
Military Applications: Another area where the above mentioned properties of lasers are being used with a 'deadly' precision is that of military applications. Lasers have been
How to make soap Soap can be made from waste fat. Secure some waste fats and melt in a dish. Strain the fat by several layers of cloth. Weigh the fat and then weigh out about o
Why chemical fertilizers should be supplemented by organic manure? Exclusive use of chemical fertilizer will eliminate organic matter and thus organisms from the soil. Important
Illustrating an eclipse of the sun Hold a small coin a few inches from one eye and close the other eye while looking at the lighted electric bulb on the ceiling of a room. The
Carbon dioxide, dry powder and vapourising liquid extinguishers : Fires produced by spilled liquids should be extinguished by directing the jet or discharge horn towards the near
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