In a ripple tank, 40 waves pass through a certain point in 1 second. If the wavelength of the wave is 5 cm, then speed of the wave is:
- A.0.5 ms-1
- B.1 ms-1
- C.1.5 ms-1
- D.2 ms-1✓
Why D is correct
Wave speed v = fλ. Here f = 40 s⁻1 and λ = 0.05 m, so v = 40×0.05 = 2 m/s. The other choices are obtained from incorrect arithmetic or unit conversion.