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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.
Define Nerve Cell Morphology The neurons in the mammalian nervous system occur in a variety of shapes and sizes. A typical cell has a cell body, the dendrites, axon and its ter
Explain Major Histocornpatability Complex (MHC) Major histocompatability complex is also known as the Human Leukocyte Antigen (HLA). MHC molecules are important components of t
Define the Pons Varolli Look at Figure Situated in front of the cerebellum below the midbrain and above the medulla oblongata, is the pons. It is involved in motor control and
The meaning of pressure Calculate the area using squared paper, and measure the force per square centimetre. Standing on one foot will deal out your weight over about half the
What is extinction? When did it happen? What are some human activities that lead into extinction
Explain Hormonal Phase of Pancreatic Secretion Hormonal phase: After food enters from the stomach to the duodenum, pancreatic secretion starts increasing. Two hormones are resp
Lab hygiene : The need for continuous attention to hygiene in any type of laboratory cannot be overemphasised. Any spillage of chemicals, battery acid, blood, plasma, serum, etc.
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Classification of Hazardous Chemicals : The classification of chemical hazards as recommended by the UN Committee of Experts on the Transport of Dangerous goods has been widely ad
do you have a protocol propogating HSV-2 in a VERO cells
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