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     EduGorilla 
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    A glass tube is open at both the ends. A tuning fork of frequency ‘f’ resonates with the air column inside the tube. Later, the tube is placed vertically inside water, so that half the length of the tube is filled with water. Now, the air column inside the tube is in unison with another fork of frequency ‘f’, then

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    1. f' = f
    2. f' = 4f
    3. f' = 2f
    4. f' = f/2
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