Two sound waves travel through air.
Wave P: frequency 500Hz, amplitude 2mm.
Wave Q: frequency 500Hz, amplitude 4mm.
Which statement about their loudness and pitch is correct?
(a) Wave Q is louder and has the same pitch as Wave P
(b) Wave P is louder and has the same pitch as Wave Q
(c) Wave Q is louder and has a higher pitch than Wave P
(d) Both waves are equally loud and have the same pitch