Hi There! :)
<span>Examples of the period, frequency, speed of a wave in a sentence?
Examples
•</span><span>He indicated the space behind him with a </span>wave<span> of a hand.
</span><span>
•</span><span>On land only the grass and trees </span>wave, but the water itself is rippled by the wind.
•<span>But wherever it may turn there always will be the </span>wave<span> anticipating its movement.</span>
•<span>Harbor was completely submerged by the great </span>wave, which still came<span>
</span>
Answer:
D. It is easy to copy.
Explanation:
It is not B, or A, nor C.
Speed of wave is given as

Wavelength of the wave is given as

now from the formula of wave time period we can say




so it will have time period of T = 4 s