• #### 1.  The wave can propagate without any medium. It is the characteristic of these waves, except . . . .

• Light
• Electromagnetic wave
• Infrared
• Sound wave

• Amplitude
• Frequency
• Crests
• Period
• #### 3.  The range audiosonic frequency is . . . .

• 20 - 2000 Hz
• 10 - 10 000 Hz
• 20 - 20 000 Hz
• 20 - 10 000 Hz
• #### 4.  The number of waves passing a point each second is . . . .

• Period
• Longitudinal waves
• Frequency
• Wavelength

• 50 seconds
• 5 seconds
• 0.2 second
• 0.02 second

• 20 Hz
• 10 Hz
• 0.5 Hz
• 0.05 Hz

• 90 seconds
• 6 seconds
• 4 seconds
• 0.25 second

• 900 m
• 300 m
• 150 m
• 100 m

• 40 m/s
• 20 m/s
• 10 m/s
• 5 m/s

• 0.2 s
• 0.5 s
• 1.0 s
• 5.0 s

• 1000 s
• 10 s
• 0.1 s
• 0.001 s

• 600 m
• 302 m
• 300 m
• 150 m

• 0.5 s
• 1.0 s
• 1.5 s
• 2.0 s
• #### 14.  Wave period means . . . .

• the highest point above the rest position
• the time taken for a full cycle of the wave
• the maximum displacement of a point of a wave from its rest position
• the number of waves passing a point each second
• #### 15.  A change of amplitude will change:

• the wavelength
• the loudness
• the frequency
• the pitch
• #### 16.  An imaginary line that is perpendicular to any surfaces is called . . . .

• imaginary line
• vertical line
• normal line
• straight line

• 5 seconds
• 10 seconds
• 15 seconds
• 20 seconds

• 16.7 m/s
• 60 m/s
• 75 m/s
• 150 m/s

• 0.4 Hz
• 1.0 Hz
• 2.5 Hz
• 4.0 Hz

• 0 cm
• 10 cm
• 15 cm
• 30 cm

• Gaung
• Gema
• Akustik
• Feedback

• 10 m
• 20 m
• 30 m
• 40 m
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