2. If the phase difference between two points is 120° for a wave with velocity of 360 m/s and frequency 500 Hz, then path difference between the two points is A.1 cm B.6 cm C.12 cm D.24 cm
Option D Solution: If v is the wave velocity and f is the frequency, wavelength is given by: λ = v/f So as per the question, λ = 360/500 = 0.72 The path difference between two points is given by λ/2π × φ = 0.72/360 × 120 = 0.24 m = 24 cm
