# Sound Study Notes for MPSC State Exam 2021

By Ganesh Mankar|Updated : August 27th, 2021

Sound Study Notes for MPSC State Exam 2021: Physics is an important subject for all MPSC exams. The MPSC State Service Examination has about six to seven questions on this subject, as well as the MPSC Combined Exam has three to four questions on this component, all the examinations like Police Recruitment, Health Department have questions on Physics. So it is important to study this topic.

## Sound

• A sound is a form of energy that is emitted by a vibrating body that travels in the form of waves and causes the sensation of hearing.
• The sound is produced by vibrations.
• Sound is transmitted in the form of waves.
• Sound waves are Mechanical - Longitudinal waves.

## Sound characteristics

• When sound waves travel through - the density of the medium changes.
• Compression
• The part that carries the vibrations is the part with the crowded mass of particles.
• Compression has a high density as well as energy.
• Rarefaction
• The part of the vibration where the particles are scattered far away.
• Rarefaction has less density and less energy.

### Wavelength

• The distance between the two nearest particles that are in the same phase is called wavelength.
• SI:m

### Amplitude

• The maximum displacement of the particles of a medium from their mean positions during the propagation of a wave is called the amplitude of the wave.
• If amplitude increases, wavelength increases.
• As the wavelength increases, the sound becomes loud.
• SI:m

### Frequency

• Frequency is the number of waves that occur over a period of time.
• SI: Hertz (Hz).

### Time period

• The time required to produce one complete wave (or cycle) is called the time period of the wave.

### Pitch of Sound

• Pitch depends on its frequency. The higher the frequency of the sound, the higher Pitch of Sound.
• The higher pitch, the sharper the sound.
• The pitch is higher for women than men.

### Velocity of Sound

• The speed of sound is lowest in air, medium in liquid and highest in static.
• Sound cannot travel through a vacuum.

## Types of sounds

### Audible range (Sonic)

• The frequency at which a human can hear this sound is 20Hz - 20KHz.
• g. human voice.

### Ultrasonic

• Its frequency is more than 20KHz.
• Humans cannot hear the ultrasonic sound, but cats, chimpanzees, rats, whereabouts, toddlers, dolphins, bats (produces up to 1 lakh Hz), etc.
• Usage:
• To detect tumours in the body
• To monitor fetal growth
• In the ECG Machine
• To preserve milk-substances

### Infrasonic Sound

• Its frequency is less than 20Hz.
• Elephants, Rhinos, Whales, etc. produce Infrasonic Sound.
• This type of sound is first produced during an earthquake, so it is used in disaster management.

## ध्वनी

 Other Important Subject Links Rock System in Maharashtra for MPSC Study Notes एमपीएससी संविधानाची ऐतिहासिक उत्क्रांती 2021- Historical Evolution of the Constitution in Marathi Soil in Maharashtra for MPSC Study Notes एमपीएससी भारताची किनारपट्टी फॉर पंसक एक्साम 2021- Coastal Plain of India for MPSC in Marathi एमपीएससी महाराष्ट्रातील प्रशासकीय एकके- Administrative Units of Maharashtra for MPSC in Marathi महाराष्ट्राचा भूगोल एमपीएससी परीक्षा 2021- Geography of Maharashtra for MPSC in Marathi Geography of Maharashtra Study Notes for MPSC Exam 2021 एमपीएससी भारतीय राज्यघटनेची निर्मिती 2021- Making of the Indian Constitution for MPSC in Marathi एमपीएससी संविधानाची ऐतिहासिक उत्क्रांती 2021- Historical Evolution of the Constitution in Marathi एमपीएससी यूरोपीयनांचे भारतातील आगमन 2021- Arrival of Europeans in India for MPSC in Marathi एमपीएससी विद्युतधारा 2021- Current Electricity for MPSC State Exams in Marathi Current Electricity Study Notes for MPSC State Exam 2021 Light Study Notes of Physics for MPSC State Exam 2021 एमपीएससी ध्वनी 2021- Sound for MPSC in Marathi एमपीएससी भौतिकशात्रातील काही मूलभूत संज्ञा 2021- Basic Terminologies of Physics for MPSC in Marathi एमपीएससी भारतातील बेरोजगारी आणि दारिद्रय 2021- Unemployment and Poverty in India for MPSC in Marathi एमपीएससी महाराष्ट्राची 'जलप्रणाली' 2021- Drainage System of Maharashtra for MPSC in Marathi एमपीएससी प्रकाश 2021- Light for MPSC State Exam in Marathi

More From Us:

write a comment

## FAQs

• The MPSC state service pre-examination consists of about six to seven questions on physics.

• The MPSC Combined Prelims Exam consists of three to four questions on the subject of Physics.

• Eighth, ninth, tenth standards science books should be read for the subject of physics.

• Yes! In Maharashtra Police recruitment, there are one to two questions on the subject of Physics.

• The main examination of MPSC PSI / STI / ASO does not have questions on the subject of Science.

### Related Posts

GradeStack Learning Pvt. Ltd.Windsor IT Park, Tower - A, 2nd Floor, Sector 125, Noida, Uttar Pradesh 201303 help@byjusexamprep.com