Question

question 5
which gif shows the lower frequency sound wave?

Explanation:

Frequency of a wave is the number of wave cycles (crests/troughs) produced per unit time. Lower frequency means fewer wavefronts are generated over the same period, so the distance between adjacent wavefronts (wavelength) is larger. The top GIF has more widely spaced wavefronts, corresponding to fewer cycles and lower frequency.

Answer:

The top GIF (the upper animation with more widely spaced circular wavefronts) shows the lower frequency sound wave.