1.

Match the following table.

Answer»

`{:(A,B,C,D),(IV,II,I,II):}`
`{:(A,B,C,D),(II,III,IV,I):}`
`{:(A,B,C,D),(I,II,IV,III):}`
`{:(A,B,C,D),(IV,III,II,I):}`

Solution :`Ato` (iv) Michelson Marley EXPERIMENT was an attempt to detect the existance of ether. The result of his experiment suggesteg the non-existance of ether.
`Bto` (iii) The Stern-Gerlach experiment demonstrated that the spatial orientation of ANGULAR momentum is quantised. Due to spin MOTION of electrons, particles have non-zero MAGNETIC moment and hence they are deflected to the magnetic field gradient from a straight path.
`Cto` (ii) Davission-Germer experiment demonstrates the wave nature of electrons i.e., the existence of de-Broglie matter waves.
`Dto` (i) By STUDYING the tracks of cosmic ray parsitively charged particles with a mass seemingly equal to that of an electron, named positron, which suggests the existence of anti-matter.


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