On a cathode-ray oscilloscope, Trace P shows 5 complete waves in 0.01 s with a peak-to-peak height of 6 divisions. Trace Q shows 10 complete waves in the same time with a peak-to-peak height of 3 divisions. Which comparison of the two sounds is correct?
(a) P has higher pitch and is louder than Q.
(b) P has lower pitch and is louder than Q.
(c) P has lower pitch and is softer than Q.
(d) P and Q have the same pitch, but P is louder.