f a wave has a wavelength of 9 meters and a period of 0.006, what is the velocity of the wave? A. 1,200 m/s B. 1,500 m/s C. 1,800 m/s D. 1,285 m/s

Answer: 1500 m/sec. (b)

Solution:

V = f (λ)

Speed = frequency. Wavelength

And frequency = 1/time period

First we will find the frequency:

Frequency = 1/time period

1/0.006 = 166.67 Hz

Using this in the equation:

Speed = frequency. Wavelength

V = f (λ)

9 * 166.67

= 1500.03 ≈ 1500

V (Speed) = 1500 m/s.

Note: Do not forget to mention the units or otherwise they may cost you marks!