No physicist has ever "seen" an electron. Yet, all physicists believe in the existence of electrons. An intelligent but superstitious man advances this analogy to argue that 'ghosts' exist even though no one has 'seen' one. How will you refute his argument ?

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Solution

No physicist has ever seen an atom but there are practical evidences and theories like Bohr's Atomic model, Rutherford's scattering experiment, etc. which prove the presence of electron. Their size is small, but we can test their existence by various methods like hydrogen spectrum.
On the other end there is no phenomena which can be explained on the basis of existence of ghosts.
So there is no comparison between the two given cases

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