SHORT ANSWER TYPE QUESTIONS
1. . What is sound ? Mention the sources of sound.
2. Why sound is called a longitudinal waves?
3.How compresions are different from rarefactions?
4.what do you mean by reflection of sound wave?
5. Why sound does not travel in space ?
6. What do you mean by absorption of sound wave?
7. Speed of sound depends upon which parameters?
8. Mention two applications of reflection of sound.
9. Why speed of sound is maximum in solids?
Answers
1.A sound is a form of energy just like electricity,lightand heat.
Their are two types of sound sources , natural and man-made.
Examples of natural sources are: animals, wind,Etc.
Examples of man-made sources are: airplanes, helicopters, vacuum cleaners and fans.Etc.
5.Because there are no molecules to vibrate. There is no sound there.
Answer:
1. sound is vibratiQPon that travel through a medium(gases, liquid and solids). sources of sound are speakers,vehicles etc
2. Sound waves are called longitudinal waves because the particles of the medium by which the sound is transported in air or in any fluid medium, it vibrates parallel to the direction in which the sound wave moves.
waves are called longitudinal waves because the particles of the medium by which the sound is transported in air or in any fluid medium, it vibrates parallel to the direction in which the sound wave moves.Therefore, the sound waves are often called longitudinal waves.
3. compression is the region of high pressure and rarefraction is the region of low pressure.
4. When sound travels in a given medium, it strikes the surface of another medium and bounces back in some other direction, this phenomenon is called the reflection of sound. The waves are called the incident and reflected sound waves.
5. sound need a medium to travel like air but in space there is vacuum so sound cannot travel in space.
6. sound absorption refers to the process by which a material, structure, or object takes in sound energy when sound waves are encountered, as opposed to reflecting the energy. Part of the absorbed energy is transformed into heat and part is transmitted through the absorbing body.
7. speed of sound depend on density.
8. Two practical applications of reflection of sound waves:
Two practical applications of reflection of sound waves:(i) Hearing aid: It is a device used by the people who are hard of hearing. Here the sound waves, which are received by the hearing aid are reflected into a narrower area leading to the ear.
Two practical applications of reflection of sound waves:(i) Hearing aid: It is a device used by the people who are hard of hearing. Here the sound waves, which are received by the hearing aid are reflected into a narrower area leading to the ear.(ii) Sound boards: Curved surfaces can reflect sound waves. This reflection of sound waves is used in auditorium to spread the waves uniformly throughout the hall. Reflection of sound waves is done by using Sound Boards. The speaker is located at the focus of the sound board.
9.