Correct Answer to Question 2

Again, we use v = f. The wavelength is 300 cm. The velocity V can be calculated from V = X/t, X is the distance traveled by the wave in the time interval t. For this case, X = 300 cm (a wavelength) in t = 2*10^-2 sec. So V = (300)(2*10^-2) = 1.5*10⁴ cm/sec. Now, the frequency is f = V/ = (1.5*10⁴)/(3*10²) = 50 Hz.

Alternatively, we can use the fact that a periodic traveling wave moves one wavelength in one period T. So, evidently, the period T is 2*10^-2 sec and the frequency is f = 1/T = 1/(2*10^-2) = 50 Hz.

Formula Sheet

Question 2

Question 3

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