3
1-18. Line E to F represents which of the
following waves?
1. Normal
2. Incident
3. Refracted
4. Reflected
1-19. Line D to H represents which of the
following references?
1. Normal
2. Perpendicular
3. Both 1 and 2 above
4. Reflected line
1-20. Which of the following statements about
a wave is the law of reflection?
1. The angle of incidence is equal to the
refracted wave
2. The angle of incidence is not equal to
the refracted wave
3. The angle of incidence is equal to the
angle of reflection
4. The angle of incidence is not equal to
the angle of reflection
1-21. If a wave passes first through a dense
medium and then through a less dense
medium, which of the following angle-
of-refraction conditions exists?
1. The angle of refraction is greater than
the angle of incidence
2. The angle of refraction is less than the
angle of incidence
3. The angle of refraction is equal to the
angle of incidence
4. The wave will pass through in a
straight line
1-22. The reception of an AM-band radio
signal over mountains can be explained
by which of the following principles of
wave propagation?
1. Reflection
2. Refraction
3. Diffraction
4. Doppler effect
1-23. What wave propagation principle
accounts for the apparent increase in
frequency as a train whistle approaches
and the apparent decrease in frequency as
it moves away?
1. Refraction
2. Reflection
3. Diffraction
4. Doppler effect
1-24. Longitudinal wave disturbances that
travel through a medium are known as
what type of waves?
1. Air
2. Sound
3. Radio
4. Light
1-25. What are the three audible frequency
ranges?
1. Subsonic, sonic, and supersonic
2. Infrasonic, sonic, and ultrasonic
3. Infrasonic, subsonic, and ultrasonic
4. Infrasonic, subsonic, and supersonic
1-26. If a bell is placed in a jar and the air in
the jar is replaced with a gas of a higher
density, what is the effect, if any, on the
speed of the sound when the bell is rung?
1. The sound stops
2. The sound travels faster
3. The sound travels slower
4. The sound is not affected
1-27. Varying which of the following wave
characteristics will cause the length of
sound waves to vary?
1. Phase
2. Quality
3. Amplitude
4. Frequency
