Question

The velocity of wave in strings A & B is respectively.

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Answer 1

Answer:

i can't understand this question

Answer 2

The time period T is the time per wave. So for 20 waves the time period will be 4/20=0.2.

Thus, frequency, f=1/T=1/0.2=5 Hz

Now the distance between a crest and a trough is equal to half of the wavelength (λ).

So, 12=λ/2 or λ=24 cm

Thus, the velocity of wave v=fλ=5(24)=120cm/s

solution

see the picture also u will be clear.....

Thank you*