Environmental Pollution: definition, cause, effects and control measures of Noise pollution
Noise pollution (ध्वनि प्रदूषण):- A loud, unpleasant or unwanted sound is called as noise. Undesirable sound that can lead to serious health hazards is called as noise pollution. Noise is physical form of pollution. It is not harmful to air, soil and water but affects the animals including humans.
(एक जोरदार, अप्रिय या अवांछित ध्वनि को शोर कहा जाता है। अवांछनीय ध्वनि जो गंभीर स्वास्थ्य समस्याओं का कारण बन सकती है, उसे ध्वनि प्रदूषण कहा जाता है। ध्वनि प्रदूषण एक भौतिक रूप है। यह वायु, मिट्टी और पानी को नुकसान नहीं पहुंचाता, लेकिन मनुष्यों सहित जानवरों को प्रभावित करता है।)
Audible range (श्रव्य सीमा):- Humans have a hearing range called as audible range. Audible range depends upon frequency and loudness of sound. For a person with normal hearing, frequency ranges from 20 to 20,000 Hz and loudness ranges from 0 to 120 dB. Sound is measured in decibels (dB). A decibel value above 80 is considered to be noise pollution.
[मनुष्यों की सुनने की एक सीमा होती है जिसे श्रव्य सीमा कहा जाता है। श्रव्य सीमा ध्वनि की आवृत्ति और तेज़ी पर निर्भर करती है। सामान्य सुनवाई वाले व्यक्ति के लिए, आवृत्ति 20 से 20,000 हर्ट्ज और तेज़ी 0 से 120 डेसीबल होती है। ध्वनि को डेसीबल (dB) में मापा जाता है। 80 से अधिक का डेसीबल मान ध्वनि प्रदूषण माना जाता है।]
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