which of the following materials would not be suitable as acoustic insulators for transducer backing?\n\na)…

which of the following materials would not be suitable as acoustic insulators for transducer backing?\n\na) cork\nb) rubber\nc) araldite loaded with tungsten powder\nd) epoxy resin\ne) c and d\nf) all of the above are not insulators
Answer
Brief Explanations:
Cork and rubber are known for their good acoustic - insulating properties. Araldite loaded with tungsten powder and epoxy resin have high density and stiffness, which make them poor acoustic insulators as they do not effectively dampen or absorb sound waves for transducer backing.
Answer:
e) C and D