Amplitude of a travelling wave on a string is 1mm. If linear mass density of string is 10–4kgm–1, tension in the string is 1N and frequency of vibration is 10Hz, then average power needed to maintain such waves in string is : (π2 = 10)
(A) 3 × 10–5W
(B) 2 × 10–5W
(C) 4 × 10–5W
(D) 10–5W
