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Science TNSB Mentoring
Class 9
Sound
Echo, Ultrasound, SONAR and the Human Ear
4.
Applications of sound
Question:
4
m.
1. List the applications of sound.
a.
Ultrasonic sound waves can be used to remove minute
foreign particles
iron blocks
.
b.
Colour
Cracks and flaws
of the metals are examined by ultrasonic sound.
2. Explain how does SONAR work?
a.
SONAR -
Sound navigation and control
Sound navigation and ranging
.
b. The transmitter produces and transmits
infrared waves
ultrasound waves
.
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