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यदि सुराही भरने के लिये नीचे रख दी जाये तो उत्पन्न ध्वनि के द्वारा जल -स्तर की वृद्धि का अनुमान दूर से कैसे लगाया जा सकता है ?

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सुराही एक वायु स्तम्भ की भाँती कार्य करेगी । जिसकी आवृत्ति `(f) prop (1)/("लम्बाई" (L))` होगी ।
जैसे-जैसे सुराही में जल-स्तर बढ़ेगा , वायु स्तम्भ की लम्बाई कम होती जायेगी, अतः इससे निकलने वाली ध्वनि की आवृत्ति बढ़ती जायेगी अर्थात ध्वनि बारीक होती जायेगी ।

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