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Why are clouds White? Why does a day have 24 hours? Answer: A cloud is a visible accumulation of very tiny water droplets or solid ice that float in the air. Clouds are usually white in appearance due to the fact that it reflects all the visible wavelengths of light from the sun. The sun's light made up of different colors(rainbow colors)that appear as a white light when combined. These colors can demonstrated using a prism that scatters the sun's light. The water droplets or ice crystals that make up the cloud reflect all the light of the seven visible wavelengths (red, orange, yellow, green, blue, indigo, and violet) all together without dispersing each color. Thus the clouds are white because they effectively reflect the wavelengths of visible light spectrum of the sun in all directions more or less equally. Answer for 2nd Question For thousands of yearspeople all over the world have been using terms and divisions like "day","night","hour", "minute", "yesterday", "tomorrow" to talk about lengths of time The idea of "a day"- from when the sun rises to when it sets-has always been a pretty basic way of thinking about time. Within "a day" people usually break down time into units we call hours. Nobody knows the exact reason why it was decided to measure out an hour so that 24 of them would fit in to a day, but we do know the practice goes all the way back o the ancient Egyptians. One reason they choseto divide a day in to a 12-hour day and a 12-hour night is probably because they used to count a system based on 12. Its also possible they chose 12 because that was the number of moon cycles in a year. , The Egyptians made and used sundials to tell time and by looking at the remains of these, we can trace what is believed to be the origins of our 24-hour day back to them.
An experiment with a loop of thread Rinse a dinner plate methodically and then fill it with water. Make a loop with thread, open it a little and float it on the water. Touch th
Define the term Bel Bel, the unit of measurement of sound, is named after Alexander Graham Bell; Bell was the inventor of the telephone, but for some curious reason, is spelt w
Stellar Parallax If the Earth were stationary, a given line joining point A on the Earth, a nearby star C and any given distant star would never vary. However, if the Earth
LAB ANIMALS : In this section, we shall deal with the important aspects concerning lab animals. You are advised to be familiar with regulations concerning experiments on animals w
Acid Rain: A side effect of air pollution is acid rain, which is now of common occurrence. You might have seen, that some industries build very tall smoke stacks to protect t
Explain Immunohistochemistry Here the Ag is tagged with a fluorescent dye (e.g. rhodamine). Inspite of a tag, the Ab binds to the Ag. In the section of a tissue, the Ag with ta
Physico-chemical properties of vitamin E are as follows: a) Tocopherols are yellow, oily liquids. b) They are freely soluble in fat solvents. c) The compounds are
Why did the continents spread apart? This is because of the heat generated from the earth's interior and earthquakes - the convection currents deep within the earth due to the
Explain Carbamoyl Phosphate Synthetase (CPSI) ? In the first step, the mitochondria1 enzyme Carbamoyl Phosphate Synthetase 1 converts the ammonia produced by glutamate dehydro
Define the Disorders of the Reproductive System Disorders that may affect the proper functioning of the reproductive system include abnormal hormone secretion, sexually transmi
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