Answer
We can rank the waves in order of frequency, from largest to smallest:
$a \gt d = e \gt b = c$
Work Step by Step
The frequency is the number of cycles per second. Let $t$ be the total time shown on each graph. We can count the number of cycles in each graph to find an expression for the frequency.
(a) $f = \frac{5~cycles}{t}$
(b) $f = \frac{2~cycles}{t}$
(c) $f = \frac{2~cycles}{t}$
(d) $f = \frac{4~cycles}{t}$
(e) $f = \frac{4~cycles}{t}$
We can rank the waves in order of frequency, from largest to smallest:
$a \gt d = e \gt b = c$
