Question

he picture shows a longitudinal wave.



Which picture best represents the wave if the amplitude is increased and the frequency is decreased?



a
A
b
B
c
C
d
D

Answer 1

Choose the picture that shows compressions and rarefactions more pronounced (larger displacement) and further apart (longer wavelength). That is option C.

Reason: increased amplitude → stronger compressions/rarefactions (more particle displacement); decreased frequency → longer wavelength → compressions are spaced farther apart.