Question

question 6 (mandatory) (1 point)
the depth of water at a point is periodic with respect to time. when the tide is out, the level of water is lowest. what features of the graph occur at these points in time?

a) troughs

b) valleys

c) peaks

d) maximums

Explanation:

In a periodic graph (like a wave representing water depth over time), the lowest points are called troughs. Peaks and maximums are the highest points, and "valleys" is not the standard term for the lowest point in a periodic graph's context. So the correct feature for the lowest water level (tide out) is troughs.

Answer:

a) troughs