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SPEED TEST1. D
The is no medium in outer space for sound to travel
2.
B
The particles inside a solid are closely packed, thus allowing the transfer of vibrational energy to be faster.
3. C
Human’s audible range is 20 Hz to 20kHz.
4 .
B
Satellite does not communicate using sound waves
5 B Time to travel across room = 0.060 s / 2 = 0.030 s
Distance = 330 x 0.030 =
9.9 m
6. C
Increase frequency of teeth hitting card to increase pitch
7. C
Higher pitch implies higher frequency , more waves generated per second
8. B
Reflected wave has the same wavelength but different velocity due to the change in direction. The amplitude will be lower.
9. A
All electromagnetic waves are transverse wave
10. B 1
st echo = (330 m x 2) / 330 ms
-1 = 2.0 s
2
nd echo = (660 m x 2) / 330 ms
-1 = 4.0 s
Therefore time interval is 2.0 s
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