Subject :- Science
Q.1 Solve the following questions.
1) Explain with reason.
• Food must have limited amount of salts.
2) Explain the difference
• Regular and irregular reflection of light.
3) Write a short note.
• Evolution of stars.
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Answers
Explanation:
1)Food must have a limited amount of salts as we require limited amounts of these in our bodies. Excessive salts in food can lead to the accumulation of water in different parts of the body such as arms, legs, etc. and lead to edema. Too much salt leads to an increase in blood pressure as well.
2)In regular reflection, light reflected from a smooth surface in a definite direction. In irregular reflection, light reflected from a rough surface in all directions and not in a definite direction.
3)Stellar evolution is the process by which a star changes over the course of time. ... Stars with at least half the mass of the Sun can also begin to generate energy through the fusion of helium at their core, whereas more-massive stars can fuse heavier elements along a series of concentric shells.
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Answer:
1) Foods must have limited amount of salt because too much salt in food can lead to hypertension or High blood pressure which may be fatal.
2) When a ray or beam of light falls on a smooth and polished surface an irregular reflection is observed when the light falls on a rough surface . As the surface is uneven ,light rays from several points gets reflected in different directions ,producing irregular reflections.
3) The interior of a typical main sequence star is illustrated by the internal conditions of the Sun, with the highest density, pressure, energy generation rate, and temperature occurring at the very center. The temperature dependency of the proton‐proton cycle means that energy is produced over a fairly large volume in the stellar center, out to about 25 percent of the total stellar radius in a star like the Sun. Within this core, the star's chemical composition slowly changes as hydrogen is converted to helium (see Figure ). In the 4.6 billion years since the Sun formed, it has used about one‐half of its hydrogen at the very center. This slow progressive conversion of light‐weight hydrogen to fewer nuclei of heavier hydrogen is accompanied by slow changes in other physical factors in the stellar interior and related slow changes in the star's surface conditions. In due course, when all hydrogen in the core is exhausted, a star must make more dramatic changes in its structure. To a biologist, changes that occur in the lifetime of a living organism are referred to as aging. Astronomers refer to the aging of a star as stellar evolution.
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