The correct option is:
crest trough
In fact, the sentence can be completed as follows:
"The amplitude of a wave is the height of a wave as measured from the highest point on the wave crest to the lowest point on the wave trough."
Answer:
I think its b lol correct me if I'm wrong
Answer
given,
difference between the two consecutive maximum
λ = 0.870 - 0.540
λ = 0.33 m
speed of sound = 340 m/s
b) frequency of the sound
v = f x λ
340 = f x 0.33

f = 1030.3 Hz
a) phase difference
the expression of phase difference is given by




now,



Zero is induced in the secondary, and the total output of the transformer consists of smoke.
Transformers only work with AC.