What physical property of the following uses non-destructive evaluation experiment

What physical property of the following uses non-destructive evaluation experiment to image
defects in materials ?
(1) Sound
(2) Heat
(3) Electrical
(4) Magnetic

Anurag Mishra Professor Asked on 19th April 2016 in Chemistry.
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    Answer: (2) Heat 

    Anurag Mishra Professor Answered on 21st April 2016.
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