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Answer 1 · 2015-04-03T16:51:03

(a) #f=3s^(-1)#

(b) #T=1/3s#

(c) #v=6"m/s"#

Speed = frequency x wavelength

#v=flambda#

If it vibrates 3 times per sec then #f=3s^(-1)#

The period #T# is the time taken for 1 complete vibration and is equal to #1/f#.

So #T=1/3= 0.33s#

and:

#v=3xx2 = 6"m/s"#