Waves on a String: a 6

Multiple Choice

Waves on a string: A 6.0-m wire with a mass of 50 g, is under tension. A transverse wave, for which the frequency is 810 Hz, the wavelength is 0.40 m, and the amplitude is 4.0 mm, is propagating on the wire. The time for a crest of this wave to travel the length of the wire is closest to

A) 19 ms.
B) 16 ms.
C) 21 ms.
D) 23 ms.
E) 25 ms.