Each of the two strings of length 51.6 cm and 49.1 cm are tensioned separatelv by 20 N force Mass per unit length of both the strings is same and equal to 1 g/m. When both the strings vibrate simultaneously the number of beats is
(a) 7
(b) 8
(c) 3
(d) 5
Correct option (a) 7
Explanation:
l1 = 0.516 m,l2=0.491 m, T =20 N
Mass per unit length, μ = 0.001 kg/m.
