An old problem from a physics quiz:
Your friend has recently purchased an ordinary looking suit on e-bay. He claims that there is a coating on the suit
that makes radio waves reflected off his suit destructively interfere (i.e. he cannot be detected by radar). This suit is
designed so that the reflection off the top surface of the coating is the same kind of reflection as off the back
surface of the coating. The smallest radar (radio) waves have a wavelength of approximately 1m.
Do you think your friend’s suit really works? If not, what should the thickness of the coating be to make it work?
Explain carefully and logically how you arrived at your answer.
that makes radio waves reflected off his suit destructively interfere (i.e. he cannot be detected by radar). This suit is
designed so that the reflection off the top surface of the coating is the same kind of reflection as off the back
surface of the coating. The smallest radar (radio) waves have a wavelength of approximately 1m.
Do you think your friend’s suit really works? If not, what should the thickness of the coating be to make it work?
Explain carefully and logically how you arrived at your answer.
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