The figure shows an oscilloscope trace for a sound wave produced by a loudspeaker.

a. Copy the figure and draw the trace for a louder sound of the same pitch.

b. It takes 1/50th of a second (0.02 s) for the whole trace to be produced.

i. Show that the frequency of the sound produced by the loudspeaker is 100 Hz.

ii. Determine the wavelength in air of the sound produced by the loudspeaker.

(The speed of sound in air is 330 m/s.)