Final answer:
The value of ef in terms of gc, ge, and gd is ef = ge, given the relationships gf = 1/2 gc, ge = 1/2 gd, and ef = 1/2 dc is ef=1/4gc. Option a is correct.
Step-by-step explanation:
The given expressions are:
gf=1/2gc
ge=1/2gd
ef=1/2dc
We want to express ef in terms of gc,ge, and gd.
First, let's isolate dc in terms of gc, ge, and gd using the given expressions:
From equation (1), gc=2gf implies gf=1/2 gc.
From equation (2), gd=2ge implies ge= 1/2gd.
So, the value of ef in terms of gc, ge, and gd is:
Substituting these into equation (3), we get:
ef=1/2⋅1/2⋅2gf
ef=1/2gf
Now, substitute gf= 1/2 gc:
ef=1/4gc
Hence, option a is correct.