NCERT Solutions Class 11 Physics - Solved Exercise Question 1.5



Question 1.5: 

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?

Solution:

No physicist has ever seen an atom but there are practical evidences which prove the presence of electron. Their size is so small, even powerful microscopes find it difficult to measure their sizes. But still its effects could be tested 
On the other end there is no phenomena which can be explained on the basis of existence of ghosts. 
Our senses of sight and hearing are very limited to observe the existence of both.
So there is no comparison between the two given cases.

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