Q: What is the relation between loudness and amplitude of vibrating body?
Ans:
Q: What is the relation between loudness and area of vibrating body?
Ans:
Q: What is the relation between loudness and distance from vibrating body?
Ans:
Q: Differentiate between loudness and intensity?
Ans:
Loudness:
It is such a characteristic of sound by which a loud and a faint sound can be distinguished.
Loudness depends upon the physical condition of ear.
Loudness is measured in terms of sound level, whose units are bel and decibel.
Intensity:
Sound energy flowing per second through a unit area held perpendicular to the direction of sound waves is called the intensity of sound.
Q: What is Weber Fechner Law?
Ans: According to Weber's law
Q: Define quality of sound?
Ans: The characteristic of sound by which two sounds of same loudness and pitch are distinguished from each other is called the quality of sound. In figure below, sounds produced by tuning fork and piano have same loudness and pitch but their waveforms are different. So their quality is different and they can be distinguished from each other.
Q: What is the difference between noise and music?
Ans: Such sounds which have pleasing effect on our ears are called musical sounds.
Sound which has jarring effect on our ears is called noise.
Q: What are major sources of noise pollution?
Ans: Auto vehicles, airplanes, helicopters, trains, heavy machinery, loud speakers are the major sources of noise pollution.
Q: What is the audible frequency range for human year?
Ans: A human ear can hear a sound only if its frequency lies between 20Hz and 20,000Hz.
Q: Write two uses of ultrasonic?
Ans:
Q: What is meant by silent whistle?
Ans: It is a whistle which has frequency in between 20,000 and 25,000Hz. This frequency is not audible for human ear so it is used to call the dogs because they can hear this range of sound waves.
Q: Define ultrasonics?
Ans: The sound waves which have frequency more than 20,000 Hz are called ultrasonics.
Q: How depth of ocean is measured by means of ultrasonics?
Ans: In measuring depth of ocean an ultrasonic pulse is sent down towards the ocean bed from the bottom of ship. This pulse after reflection from the ocean bed reaches the ship where it is detected. The time taken by the pulse of ultrasonic in reaching the bed and back to ship is noted, them using the formula S=vt, the depth (s) of the ocean is measured.
Ans:
Loudness ∞ Amplitude of vibrating bodyIf amplitude of vibrating body is large sound will be loud, if amplitude of vibrating body is small sound will be low. That is the reason why sound produced by sitar is loud if its wires are plucked violently.
Q: What is the relation between loudness and area of vibrating body?
Ans:
Loudness ∞ Area of vibrating bodyIf area of vibrating body is large sound will be loud, if area of vibrating body is small sound will be low. The sound produced by large drum is louder than that by a small drum because of its large vibrating area.
Q: What is the relation between loudness and distance from vibrating body?
Ans:
Loudness ∞ 1/Distance from vibrating bodyIf distance from vibrating body is large sound will be low, if distance from vibrating body is small sound will be loud.
Q: Differentiate between loudness and intensity?
Ans:
Loudness:
It is such a characteristic of sound by which a loud and a faint sound can be distinguished.
Loudness depends upon the physical condition of ear.
Loudness is measured in terms of sound level, whose units are bel and decibel.
Intensity:
Sound energy flowing per second through a unit area held perpendicular to the direction of sound waves is called the intensity of sound.
I = sound energy/ unit area
I = W/ m²Intensity does not depend upon physical condition of ear.
Q: What is Weber Fechner Law?
Ans: According to Weber's law
L ∞ log I
L = K log IWhere K is a constant of proportionality. L is loudness and I is intensity of sound.
Q: Define quality of sound?
Ans: The characteristic of sound by which two sounds of same loudness and pitch are distinguished from each other is called the quality of sound. In figure below, sounds produced by tuning fork and piano have same loudness and pitch but their waveforms are different. So their quality is different and they can be distinguished from each other.
Ans: Such sounds which have pleasing effect on our ears are called musical sounds.
Sound which has jarring effect on our ears is called noise.
Q: What are major sources of noise pollution?
Ans: Auto vehicles, airplanes, helicopters, trains, heavy machinery, loud speakers are the major sources of noise pollution.
Q: What is the audible frequency range for human year?
Ans: A human ear can hear a sound only if its frequency lies between 20Hz and 20,000Hz.
Q: Write two uses of ultrasonic?
Ans:
- The resources of oil and gas beneath the earth are searched by using ultrasonic.
- The depth of an ocean can be measured by using ultrasonic.
Q: What is meant by silent whistle?
Ans: It is a whistle which has frequency in between 20,000 and 25,000Hz. This frequency is not audible for human ear so it is used to call the dogs because they can hear this range of sound waves.
Q: Define ultrasonics?
Ans: The sound waves which have frequency more than 20,000 Hz are called ultrasonics.
Q: How depth of ocean is measured by means of ultrasonics?
Ans: In measuring depth of ocean an ultrasonic pulse is sent down towards the ocean bed from the bottom of ship. This pulse after reflection from the ocean bed reaches the ship where it is detected. The time taken by the pulse of ultrasonic in reaching the bed and back to ship is noted, them using the formula S=vt, the depth (s) of the ocean is measured.
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