The phase difference between two points separated by 1m in a wave of frequency 120 Hz is 90°. The wave velocity is

(1) 180 m/s

(2) 240 m/s

(3) 480 m/s

(4) 720 m/s

(3) Path difference Δ=λ2π×ϕ1=λ2π×π2λ = 4m

Hence v=nλ = 120×4=480 m/s

Difficulty Level:

  • 8%
  • 25%
  • 61%
  • 9%