Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) People Development & Environment Environmental Issues Pollution

शोर के स्तरों (db) को मानव श्रवण देहली के लिए ________ की आवृत्ति पर संदर्भित किया जाता है

1
50 Hz
2
100 Hz
3
1 KHz
4
4 KHz
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