QUIZ 13 CHAPTER 19

 

 
23. How far in terms of wavelength does the crest of a wave travel in  6 periods? 
a. one sixth of a wavelength
b. 6 wavelengths*
c. 3 wavelengths
d  nota
24. The vibrations  of a  wave on a string move in a direction
a. along the direction of motion of  the wave  
b. at right angles to the direction of motion of the wave* 
c.  nota
25.The vibrations  of a sound  wave move in a direction
a. along the direction of motion of the wave* 
b. at right angles to the direction of motion of the wave
c.  nota
26. A transverse wave has wavelength  0.5 m and the frequency  is  6 cycles per second. The wave speed is     
a. 1/3 m/s
b. 3  m/s*
c. 12 m/s
d. 1/12 m/s
e. nota
27. True or False. A standing wave can be thought of as the sum of  two waves moving in the same direction. 
a. True
b. False*
28  In a transverse standing wave, an anti-node is a position of 
a. zero or minimal transverse displacement
b. maximum transverse displacement* 
29. A railroad locomotive is at rest with its whistle blowing and  starts moving toward you. The frequency that you  hear will 
a. increase *
b. decrease
c. will not change 
30. In the previous problem, the wavelength reaching your ear will 
a. increase 
b. decrease *
c. remain the same
31. Assuming the wave speed remains the same, when the frequency of a wave decreases, the wavelength
a. decreases
b. increases*
c. remains the same