Use the following information to answer questions 32 to 34.
A progressive wave is represented by the equation \( y=25 \sin \left(200 t-\frac{x}{40}\right) \) where x is in \( \mathrm{m}, \mathrm{y} \) in cm and t is in seconds.
32. What is the wavelength of the wave?
A. 25 m
B. 40 m
C. 80 m
D. 251 m
33. The number of complete oscillations made in one second is \( \qquad \) A. 25
B. 31
C. 40
D. 200
34. The amplitude of the wave is \( \qquad \) A. 25 mm
B. 40 mm
C. 25 cm
D. 40 cm
35. Longitudinal waves propagating in air consist of regions of alternate high and low pressures known as
A. crests and troughs
B. echoes and reverberations
C. progressive and transverse
D. compressions and rarefactions