10th Class Physics Chapter 2 Sound Short Question Answer
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10th Class Physics Chapter 2 Sound Short Question Answer
The number of vibration s per cycle of a vibrating body none second is called frequency.
Ultrasonic waves carry more energy and short wavelength therefore ultrasonic waves are used to diagnose and treat different ailments.
Loudness:
i. Characteristics of sound by which we can distinguish between loud and faint Sounds is called loudness.
ii. It is not physical quantity.
Distance between two consecutive compressions or rarefactions is called the wavelengths of sound wave.
the chest piece consists of a plastic disc called diaphragm in stethoscope.
“Loudness is the characteristics of sound by which loud and faint sounds cab be distinguished”. Loudness depends upon a number of factors. Such as.
i. Amplitude of the vibrating body
ii. Araa of the vibrating body
iii. Distance from the vibrating body
iv. Physical condition of ear.
It depends upon the frequency. A higher pitch means higher frequency and vice versa.
Noise is a nuisance because it causes offence annoyance, trouble or injury.
The echo is formed through reflection but the reflection does not form echo. All sounds reflect back but it is not necessary that all reflections produce echo.
The distance covered in unit time is called speed.
Sound waves are called mechanical waves because they require material medium for their propagation.
Frequency: The number of vibration completed in one second is called frequency. Its unit is hertz.(Hz)
Sounds which are pleasant to our ears are called musical sounds. e.g. sounds of guitar and violin.
The range of the frequencies which a human ear can hear is called the audible frequency range.
Sound energy passing per second through a unit area held perpendicular to the direction of propagation of sound waves is called intensity of sound.
SONAR is “sound navigation and ranging”. It is a technique used to estimate the distance of object from the ocean surface.
The frequency of the voice of ladies is higher than that of men. Therefore, the voice of ladies is shrill and of high pitch.
When sound is incident on the surface of a medium it bounces back into the first medium, thisphenomenon is called echo or reflection of sound.
Transportation equipment, heavy machinery, loud vehicles horns and alarms are the source of noise pollution.
By using an”Oscilloscope” we can see sound waves.
The property of sound by which we can distinguish between two sounds of same loudness and pitch is called quality.
