Water waves in the sea are observed to have a wavelength of 300 m and a frequency of 0.07 Hz. The speed of these waves is:
A) 0.00021 m/s
B) 2.1 m/s
C) 21 m/s
D) 210 m/s
E) none of these

Question

Quizplus · Accepted Answer

The speed of a wave can be calculated using the formula: speed = wavelength x frequency. 
Substituting the given values for wavelength and frequency, we get:
speed = 300 m x 0.07 Hz
speed = 21 m/s

Water Waves in the Sea Are Observed to Have a Wavelength