1)as time passes, which of these is decreasing?
a) amplitude
b) crest
c) trough
d) wavelength

2)which graph best represents the relative speeds of electromagnetic and mechanical waves through space?
a)
b)
c)
d)

3)which of these waves would have the greatest amount of energy?
a) a
b) b
c) their energy is equal
d) there is not enough information

pls me.