Let, f1 and f2 be the frequency of the two turning forks, given f1−f2=5......‌ (i) ‌ Length of wire in sonometer is L1=0.96m‌ and ‌L2=0.97m Frequency of vibration of the wire is given by f=‌
1
2l
√T∕m According to the question, ‌‌
f1
f2
=‌
l2
l1
=‌
0.97
0.96
>1 ∴‌‌f1>f2 Now, from Eq. (i) ⇒f1−f2=5 ⇒‌