Acoustics is a subdivision or branch of physics that deals with examining and studying sound. Acoustics can also be defined as the science concerned with the study of the production of sound, its control, transmission, response, and various properties of sound.
People working in acoustics technology will be titled Acoustical Engineers, while a researcher, a scholar or a scientist who studies acoustics is known as an Acoustician. The most crucial application of acoustics is creating the music or speech sound as perfect as possible.
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Important Questions on Acoustics
1) What is acoustics?
Acoustics is a science concerned with the study of sound production, its control, transmission, response, and various properties of sound.
2) What are the types of acoustics?
The following are the types of acoustics:
- Environmental Noise
- Ultrasounds
- Infrasound
- Musical Acoustics
- Vibration and Dynamics
3) What is psychoacoustics?
Psychophysics is a branch of physics that deals with the scientific study of sound perception and audiology.
4) Name the stages of an acoustic event.
An acoustic event involves the following stages:
- Cause or generating mechanism
- Reception effect
- Acoustic wave propagation
5) What are ultrasounds?
The sounds that have a frequency larger than the human audible limit are called Ultrasounds.
6) Why are the ceilings of concert halls curved? Explain.
The ceilings of concert halls are curved to reflect the sound from the ceiling to reach every corner of the concert hall, enabling the audience to hear sound very clearly.
7) As compared to a dry day, why does sound travel faster on a rainy day?
There is more humidity in the atmosphere during rainy days. The speed of the sound usually increases with humidity and also the speed of sound in water is 4 times more than its speed in air. Therefore, sound travels faster on a rainy day.
8) Why does an empty container produce more sound than a filled one?
Only air is present inside in an empty container. Therefore, whenever sound is produced in an empty container, due to numerous reflections in the air molecule, vibrations will be more. But there are a very small number of air molecules in a filled container, so it does not produce more sound.
9) What is Sonar?
The Sound Navigation and Ranging device (SONAR) is based on the principle of the echo-surrounding method of Ultrasonics. It is an acoustical technique in which a high frequency sound pulse is transmitted and then received after its reflection from objects like submarines.
10) List some medical applications of the Ultrasonic in industries.
- Diagnostic application: Ultrasonic waves are used for detecting tumours.
- Disease treatment: Ultrasonic waves play a major role in the treatment of diseases like neuralgic pains.
- Surgical Application: Ultrasonic waves also help to eliminate the brain tumours and kidney stones without the blood loss.
Practice Questions
- What is the range of frequencies associated with (a) Infrasound? (b) Ultrasound?
- Why is a sound wave called a longitudinal wave?
- Does sound follow the same laws of reflection as light does? Explain.
- Both thunder and flash are produced simultaneously. But a few seconds after the flash is seen, the thunder is heard. Why?
- What is the loudness of sound? What factors does it depend on?
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