QUESTION 9 Which of the following statements are tru about sound? Doubling the frequency of a sound will increase the perceived pitch of the sound by one musical octave. O Sound travels fastest in air. O) In terms of hearing, the dyamic range (sensitivity to the amplitude of the pressure wave) of humans is much broader than the frequency range (pitch). All frequencies of sound travel at the same speed within a medium. O Sounds requires a elastic medium top propagate. QUESTION 10 When sound is refracted the wave front will ... O bend towards high temperature zones. O bend towards low temperature zones. bend more if the frequency of the wave is higher. O bend more if the frequency of the wave is lower