# What is Sonar short answer?

Sonar uses sound waves to ‘see’ in the water. Sonar, short for Sound Navigation and Ranging, is helpful for exploring and mapping the ocean because sound waves travel farther in the water than do radar and light waves.

## What is sound Class 9 note?

Note: An impure sound produced by mixture of many frequencies is called a note. For example: A musical note has tones of various frequencies. The audible range of human ear is 20 Hz and 20,000HZ, i.e., the human ears can hear only those waves whose frequency lies between 20 Hz and 20,000HZ.

## What is sound in physics in 9th class?

Sound is a mechanical energy which produces sensation of hearing. Sound is produced due to vibration of different objects. • Sound wave propagates as compressions & rarefactions in the medium. Sound waves are longitudinal waves.

## What is note in sound physics?

A sound produced due to single frequency is called a tone and sound that is produced due to a mixture of several frequencies is called a note.

## What is sound class 9th answer?

Answer: Sound waves force the medium particles to vibrate. Hence, these waves are known as mechanical waves. Sound waves propagate through a medium because of the interaction of the particles present in that medium.

## What is the SI unit of sound?

Since this energy can be measured, the most common SI unit of sound that is used is Decibel which is abbreviated as dB. This unit is basically used to express the ratio of some value of a physical property to another, mainly on a logarithmic scale. This is called as Decibel Scale or DB Scale.

## What is unit of sound?

We measure sound intensity (also referred to as sound power or sound pressure) in units called decibels. Decibels (dB) are named in honor of Alexander Graham Bell, the inventor of both the telephone and the audiometer.

## What are the 2 types of sound waves?

The study of sound should begin with the properties of sound waves. There are two basic types of wave, transverse and longitudinal, differentiated by the way in which the wave is propagated.

## What are the types of sound?

There are many different types of sound including, audible, inaudible, unpleasant, pleasant, soft, loud, noise and music.

## What are the 5 characteristics of sound?

The five main characteristics of sound waves include wavelength, amplitude, frequency, time period and velocity. Wavelength: The most important characteristic of sound waves may be the wavelength. Sound consists of a longitudinal wave that includes compressions and rarefactions as they travel through a given medium.

## What are the 3 types of sound waves?

Sound waves fall into three categories: longitudinal waves, mechanical waves, and pressure waves. Keep reading to find out what qualifies them as such. Longitudinal Sound Waves – A longitudinal wave is a wave in which the motion of the medium’s particles is parallel to the direction of the energy transport.

## What are the 3 properties of sound?

We will look in detail at three fundamental characteristics of sound: speed, frequency, and loudness.

## What is this type of sound called?

There are two types of sound, Audible and Inaudible. Inaudible sounds are sounds that the human ear cannot detect. The human ear hears frequencies between 20 Hz and 20 KHz. Sounds that are below 20 Hz frequency are called Infrasonic Sounds.

## How do we fall ill notes?

Immediate cause: The organisms that enter our body and causes disease is called immediate cause. For example, virus, bacteria, protozoa etc. surroundings, contaminated food, improper nourishment, poverty, poor standard of living etc. Diseases may be due to infectious and non-infectious causes.

## What is loudness and intensity of sound?

The intensity of a sound is the power of the sound in Watts divided by the area the sound covers in square meters. The loudness of a sound relates the intensity of any given sound to the intensity at the threshold of hearing. It is measured in decibels (dB).

## What is the formula of sound?

If the temperature is TC = 20 °C (T = 293 K), the speed of sound is v = 343 m/s. The equation for the speed of sound in air v = √γRTM can be simplified to give the equation for the speed of sound in air as a function of absolute temperature: v=√γRTM=√γRTM(273K273K)=√(273K)γRM√T273K≈331m/s√T273K. v=fλ.

## What is the range of sound?

A normal human ear is able to hear sounds with frequencies from 20 Hz to 20,000 Hz. The range of 20 Hz to 20,000 Hz is called the audible frequency range. The sounds we hear comprise of various frequencies.

## What is unit of velocity?

The SI unit of velocity is metre per second (m/s). Alternatively, the velocity magnitude can also be expressed in centimetres per second (cm/s).

## What is volume of sound?

The volume of a sound is how loud or quiet the sound is. Sounds are vibrations that travel through the air. A nail hit hard with a hammer will make a strong vibration, which means it will make a loud sound. A nail hit gently with a hammer will make a weak vibration, which means it will make a quiet sound.

## What is SI unit of frequency?

The SI unit for frequency is the hertz (Hz). One hertz is the same as one cycle per second.

## How is sound measured?

Noise level is measured in decibels (dB). The louder the noise, the higher the decibels. Decibels can be adjusted to human hearing. Noise level is thus described in decibels A (dBA).

## What are the 4 properties of sound?

Since sound is a wave, it has all of the properties attributed to any wave, and these attributes are the four elements that define any and all sounds. They are the frequency, amplitude, wave form and duration, or in musical terms, pitch, dynamic, timbre (tone color), and duration.

## What are uses of sound?

• Communication. For many animals including us, sound is a main form of communication.
• Music.
• Localisation.
• Enhancing Cell Growth.
• Being Unique.
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## What causes a sound?

Sound is caused by the simple but rapid mechanical vibrations of various elastic bodies. These when moved or struck so as to vibrate, communicate the same kind of vibrations to the auditory nerve of the ear, and are then appreciated by the mind.

## What are properties of sound?

• Property 1: Pitch/Frequency. The perception of frequency of sound by human ear within the range of human hearing is called the pitch.
• Property 2: Amplitude/Loudness.
• Property 3: Speed.
• Property 4: Reflection of sound.
• Property 5: Timbre.