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Class 10 Physics Chapter 2 Notes
Class 10 Physics Chapter 11 Important Short Questions
- Sound is produced by a vibrating body. It travels in the medium from one place to another in the form of compressional waves.
- Loudness is a feature of sound by which a loud and a faint sound can be distinguished. It depends upon the amplitude, surface area, and distance from the vibrating body.
- Sound energy flowing per second through a unit area held perpendicular to the direction of sound waves is called the intensity of sound.
- bel is a unit of the intensity level of sound, where 1 bel = 10 decibels
- The pitch of the sound is the characteristic of sound by which a shrill sound can be distinguished from a grave one. It depends upon the frequency.
- The characteristics of sound by which two sound waves of the same loudness and pitch are distinguished from each other is called the quality of sound.
- The sounds with a jarring effect on our ears are called noise and the sounds having a pleasant effect on our ears are called musical sounds.
- Noise pollution has become a major issue of concern in some big cities. Any form of sound that disturbs the normal functioning of any natural ecosystem or some human community is the cause of noise pollution.
- Noise pollution can be reduced to an acceptable level by replacing rusty noisy machinery with environment-friendly machinery and equipment, putting sound-reducing barriers, or using hearing protection devices.
- The technique or method used to absorb undesirable sound energy by soft and porous surfaces is called acoustic protection. This can be done by using soft, rough, and porous materials.
- The human audible frequency range lies between 20 Hz to 20,000 Hz.
- Sound waves of frequency higher than 20,000 Hz are called ultrasound while sound waves of frequency lower than 20 Hz are called infrasound.
- Ultrasound is used in many fields of science and technology such as medicine, engineering, and agriculture. In the medical field ultrasound is used to diagnose and treat different ailments. Ultrasound is also used to locate underwater depths or for locating objects lying deep on the ocean floor. The technique is called SONAR, an acronym for sound navigation and ranging.
Briefly Answer Of These Questions.
- What is the effect of the medium on the speed of sound? In which medium sound travels faster: air, solid or liquid? Justify your answer.
- How can you prove the mechanical nature of sound by a simple experiment?
- What do you understand by the longitudinal wave? Describe the longitudinal of sound waves.
- Sound is a form of wave. List at least three reasons to support the idea that sound is a wave. We know that waves manifest phenomena of reflection, refraction, and action.
- Does sound also manifest these characteristics?
- What is the difference between the loudness and intensity of sound? Derive the on-ship between the two.
- On what factors does the loudness of sound depend?
- What do you mean by the term intensity level of the sound? Name and define the unit of intensity level of sound.
- What are the units of loudness? Why do we use a logarithmic scale to describe the sound intensities we hear?
- What is the difference between frequency and pitch? Describe their relationship with Cally.
- Describe the effect of change in amplitude on loudness and the effect of change in frequency on the pitch of sound.
- If the pitch of sound is increased, what are the changes in the following?
- a. the frequency
- c. the wave velocity
- b. the wavelength
- d. the amplitude of the wave
- If we clap or speak in front of a building while standing at a particular distance, we rehearse our sound after some time. Can you explain how does this happen?
- What is the audible frequency range for the human ear? Does this range vary with the age of people? Explain.
- Explain that noise is a nuisance.
- Describe the importance of acoustic protection.
- What are the uses of ultrasound in medicine?
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