a. The frequency is increased. b. The frequency is reduced. C. The frequency remains the same. 17) Which one of the foll

[answerhappygod]

a. The frequency is increased.
b. The frequency is reduced.
C. The frequency remains the same.
17) Which one of the following statements concerning traveling sound waves in air is false?
a. Traveling sound waves are longitudinal waves.
b. Traveling sound waves consist of alternating regions of compressed and expanded air.
c.A typical speed of sound in air is 680 m/s.
d. The displacement amplitude of a traveling sound wave may be described by a sinusoidal function.
18) A siren emits a sound wave with frequency fo. The frequency you hear from t = 0 to t = 2 s is below the frequency you hear from t=2s to t = 4s is above fo. Which is the correct description of the sire motion?
a. It moves from left to right and passes you at t = 2 s.
b. It moves from right to left and passes you at t = 2 s.
C. It moves toward you for 2 s but doesn't reach you, then reverses direction at t = 2 s and m away.
d. It moves away from you for 2 s, then reverses direction at t = 2 s and moves toward you b doesn't reach you.
19) Two square waves of a width of 2 m and height 1 m approach each other along a horizontal string. they collide and interact, the resulting wave will be
a. 2 m wide and 1 m high
b. 2 m wide and 0.5 m high
C. 2 m wide and 2 m high
d. 4 m wide and 1 m high
e. The waves will dissolve.