Physics Course: 3rd Name: rasulov. B
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RASULOV BUNYOD ORALIQ INLIZ TILI
- Bu sahifa navigatsiya:
- Physics
- 1) Which of the following is a mechanical vibration a) Sound b) Light c) Water d) Reflection 2) Which of the following statements is true
- 3) Which of the following best defines reflection
- 4) Which of the following explains light waves bending as it passes through water
- Writing Section
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«ТАСДИКЛАЙМАН» Факультетлараро чет тиллар кафедраси мудири в.б. 
Д.Т.Мазлитдинова Faculty: Physics________________ Course: 3rd Name: ___RASULOV. B_______ ___ Intermediate Control Work Variant 2 Reading Light and sound is found everywhere. Light and sound waves travel from place to place and can be seen and heard. Light is visible to the human eye and is responsible for the sense of sight. It is a form of energy we can see when it is reflected off the surface of an object. Sound is a mechanical vibration that can pass through solids, liquids, and gases and can usually be identified by the sense of hearing. Light travels at a speed of 186,000 miles per second. Light is unable to travel through solids, but it can
There are two properties of light. The first property of light is called reflection. Reflection is when light bounces off a surface which then allows the object to be visible to the eye. For example, when the moon is seen in the sky, it is because the light from the sun reflects off the surface of the moon. The second property of light is called refraction. Refraction is when a ray of light passes from a transparent medium to another transparent medium such as from air to water, it changes speed and the way it bends. For example, when a pencil is placed into a glass of water, the pencil will seem like it is broken into two pieces. Because the light is traveling through the water, there is refraction, and the light bends causing the pencil to look like it is in two pieces. The molecules that make up a solid are closer together allowing the sound to travel faster. Molecules are the substances that make up solids, liquids, and gases. In a liquid, the molecules are farther apart, so the sound waves travel slower. In a gas, the molecules are spread farther apart so the sound waves travel much slower. A sound traveling through a solid can be better heard than traveling through a gas. For example, a vibrating speaker collides with the molecules in the air passing along the energy and creating sound waves. This is why music can be heard from the speakers. When there are no molecules in the air, like in space, the sound could not be heard. The speed of sound travels much slower than the speed of light.
Isaac Newton was an English physicist and mathematician famous for his laws of physics. He was a key figure in the Scientific Revolution of the 17th century. Isaac Newton was a physicist and mathematician who developed the principles of modern physics, including the laws of motion and is credited as one of the great minds of the 17th-century Scientific Revolution. Newton was born on January 4, 1643, in Woolsthorpe, Lincolnshire, England. Using the "old" Julian calendar, Newton's birth date is sometimes displayed as December 25, 1642. Newton was the only son of a prosperous local farmer, also named Isaac, who died three months before he was born. A premature baby born tiny and weak, Newton was not expected to survive. When he was 3 years old, his mother, Hannah Ayscough Newton, remarried a well-to-do minister, Barnabas Smith, and went to live with him, leaving young Newton with his maternal grandmother. The experience left an indelible imprint on Newton, later manifesting itself as an acute sense of insecurity. He anxiously obsessed over his published work, defending its merits with irrational behavior. At age 12, Newton was reunited with his mother after her second husband died. She brought along her three small children from her second marriage. Newton was enrolled at the King's School in Grantham, a town in Lincolnshire, where he lodged with a local apothecary and was introduced to the fascinating world of chemistry. His mother pulled him out of school at age 12. Her plan was to make him a farmer and have him tend the farm. Newton failed miserably, as he found farming monotonous. Newton was soon sent back to King's School to finish his basic education. Perhaps sensing the young man's innate intellectual abilities, his uncle, a graduate of the University of Cambridge's Trinity College, persuaded Newton's mother to have him enter the university. Newton enrolled in a program similar to a work-study in 1661, and subsequently waited on tables and took care of wealthier students' rooms. Download 29.82 Kb. Do'stlaringiz bilan baham: 
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