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Frequency Plaque

Frequency Plaque

Frequency Plaque:#0 Frequency Plaque:#0
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1.which of the following is not an application of ultrasound?

a)to see osition of an unborn baby inside mother womb
b)to detect cracks in metal structures of an aircraft
c)to vibrate plaque off surface of teeth
d)to take photograph of a bone fracture inside body

2.what happens to frequency and loudness of sound waves when it is reflected?
FREQUENCY ----------- LOUDNESS
a)unchanged ------------ decreases
b)increases ---------- decreases
c)unchanged ---------- increases
d)increases ---------- unchanged

3.a transmitter emits ultrasonic waves to detect underwater objects
( http://i806.photobucket.com/albums/yy349/hallowvale/thepulse.jpg ) the diagram shows traces of a transmitted pulse and its echo

if ultrasonic waves travels with a speed of 1500m/s in water,how far is the object?
a)600m
b)1200m
c)1875m
d)3750m

1. d)
2.a)
3) If the time taken is 25 s for the two way trip ( It is not clear in the diagram),
2 d / t = v
d = v t / 2 = 1500 x 25 / 2 = 1875 m
Ans. c)

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