Frequency of oscillation of a block with two springs separately are 3Hz and 4Hz. Frequency of oscillation of same block with both springs connected in parallel is

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7 Hz

5 Hz

127 Hz

10 Hz

answer is B.

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Detailed Solution

f=12πkm; 3=12πk1m⇒k1m=(6π)2& 4=12πk2m⇒k2m=(8π)2 f=12πk1+k2m⇒f=12π(6π)2+(8π)2=5Hz

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