Advertisements
Advertisements
Question
Explain how, flaws (or defects) in a metal block can be detected by using ultrasound.
Advertisements
Solution
Ultrasound waves are made to pass through one face of the metal block and ultrasound detectors are placed on the opposite face of the block to detect the transmitted ultrasound. In doing so, we have two possibilities:
(i) If the ultrasound waves pass uninterrupted through all parts of the metal block, then the block is flawless.
(ii) If the ultrasound waves are not able to pass through a part of the metal block and get reflected back, then there is a flaw in the metal block.
Hence, the flaw can be detected without damaging the metal block.
APPEARS IN
RELATED QUESTIONS
Give two practical applications of reflection of sound waves.
Explain how defects in a metal block can be detected using ultrasound.
Fill in the blank with suitable word :
Loudness of sound depends on .....................
Explain the term 'pitch' of a sound. On what factor does the 'pitch' of a sound depend ?
Draw labelled diagrams to represent sound of (a) low pitch, and (b) high pitch, of the same loudness.
Name an animal which navigates and finds food by ecolocation.
In SONAR we use:
Fill in the blank and explain.
To discover a sunken ship or objects deep inside the sea, ______ technology is used.
The depth of an ocean can be determined by ______.
Expand the abbreviation of the term SONAR.
