Question

1. listener moves around the source in a circular orbit then Doppler effect is *

2 points

maximum

minimum

no

none of the above

2. '10 k Hz' is *

2 points

ultrasonic waves

infrasonic waves

audible wave

mesaSonic waves

3. ultrasonography.................. principle is used

*

2 points

refraction

diffraction

echo

4. the persistence of hearing for human ear is *

2 points

0.2 s

0.1 s

0.3 s

5. the minimum distance to hear an echo is *

2 points

17.2 m

0.1 s

100 m

10 m​

Answer 1

Answer:

ok ok on my way now to get

Explanation:

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Answer 2

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