WorksheetsApplication of Reflection of Sound Waves
Total questions: 7
Worksheet time: 4mins
Sound can reflected easily by .......
Curtains
Carpets
Walls
Paper
SONAR is a technique or device that used for :
I. detecting objects under water
II. detect cracks in metal structures
III. measure depth of the sea
IV. investigate the abdomen and heart conditions
I and II
II and III
I and III
I and IV
The echo-sounder of a ship measures an interval of 0.6s and the speed of sound in water is 1200 ms-1.
Calculate the depth, in m, of the sea?
680 m
390 m
720 m
360 m
The figure above shows a beam of sonar waves sent to a shoal of fish directly below a fishing trawler.
The speed of the sonar waves in water is 1500 ms-1 and the echo is detected after 0.16s.
Calculate the value of d?
105 m
125 m
120 m
110 m
Below is another example of uses of reflection of sound, except ....
shehnais
stop-clock
megaphones
trumpet
In industry, all true about ultrasonic scanning is used to, except ....
Cutting and welding metals
Locate the boundaries between rock layers
Measure depth of the sea
Detect cracks in metal structures
Ultrasound is a kind of sound wave with its frequency of more than ......
50 kHz
40 kHz
30 kHz
20 kHz
