Nature of Sound
Nature of Sound
Nature of sound: Sound is a form of energy which produces a sensation of hearing in our ears. It is a vibration that propagates through a medium in the form of a mechanical wave. If there is no medium to vibrate then no sound is possible, sound cannot travel in a vaccum.
Reflection of sound: Sound reflects from a smooth surface in the same way the light does. The angle of incidence is equal to the angle of reflection.When a sound hits a hard surface, it reflects back to its source This reflection of the sound is called as echo. Sometimes, we hear multiple echoes from a source of the sound if the area is large and has multiple reflecting surfaces such as valleys and huge empty rooms. This phenomenon is known as reverbration.
Different sources produce different sounds: Sound produced by a guitar is different from produced by a drum. This is because the sound produced by different sources have different characteristics.Sound can be characterized by its frequency, wavelength and amplitude.
Speed of sound and light: The speed of sound in air is about 344 m/s at 22°C and 331 m/sec at 0°C and the speed of light in air is Thus, speed of light is very great as compared to the speed of sound. It is observed that in the rainy season, the flash of lighting is seen first and the sound of thunder is heard a little later, though both are produced at the same time in clouds. It is because of very high speed of light due to which we see the flash of lightning first and it is because of low speed of sound that the thunder is heard a little later.
Speed of sound in different media: Sound propagates through a medium at a finite speed. The medium can be a solid substance, a liquid or a gas. These are called material media. The speed of sound depends on the properties of medium through which it travels. The speed of sound in a medium depends on temperature of the medium. The speed of sound decreases when we go from solid to gaseous state. If temperature of the medium increases, then speed of sound also increases.
NOTE: SONIC BOOM: When the speed of any object exceeds the speed of sound, it is said to have supersonic speed. Many objects such as some aircrafts, bullets and rockets, etc, travel at supersonic speeds. When a sound producing source moves with a speed higher than that of sound, it produces shock waves in air, which carry a large amount of energy. The tremendous air pressure variations caused by the shock waves produce a loud burst of sound is known as sonic boom. It produces untolerable loud noise which causes pain in our ears. The shock waves produced by a supersonic aircraft have enough energy to shatter glass and can even damage buildings.
A person, pressing his ear on the railway tracks can hear an approaching train.This is possible due to: | |||
| Right Option : C | |||
| View Explanation | |||
The intensity of sound increase at night due to _____________________________ | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following statement is corect ? | |||
| Right Option : D | |||
| View Explanation | |||
Students / Parents Reviews [10]
Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
10thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
10thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Cheshta
10thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
