Correct option: (b) 1000 Hz
Explanation:
Total length of sonometer wire, l = 110 cm = 1.1 m
Length of wire is in ratio, 6 : 3 : 2 i.e. 60 cm, 30 cm, 20 cm.
Tension in the wire, T = 400 N
Mass per unit length, m = 0.01 kg
Minimum common frequency = ?
As we know,
Hence common frequency = 1000 Hz