Physics · Waves
एक खुले ऑर्गन पाइप की प्रथम अधिस्वरक (first overtone) आवृत्ति एक बंद ऑर्गन पाइप की मूल आवृत्ति के बराबर है। यदि बंद ऑर्गन पाइप की लंबाई 20 cm है, तो खुले ऑर्गन पाइप की लंबाई ________ cm होगी।
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