Question

What is loudness?

a)the frequency of a sound wave
b)the rate at which a wave’s energy flows through a given area
c)the amplitude of a sound wave
d)the physical response to the intensity of sound, modified by physical factors

Answer 1

D is right but c fits as well

Answer 2

D is the best answer.  C is somewhat true, increasing the amplitude of a wave will make it louder, but loudness depends on the listener.  To a person hard of hearing, a given amplitude will sound quieter than for a normal hearing person.