एक व्यकित को अपनी प्रतिध्व – McqOptions

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1.	एक व्यकित को अपनी प्रतिध्वनि सुनने के लिए प्रवर्तक तल से कितनी दूरी खड़ा रहना चाहिए
A.	100फिट
B.	56फिट
C.	224फिट
D.	28फिट
Answer» C. 224फिट

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