MCQ
The coefficient of linear expansion depends on
- AThe original length of the rod
- BThe specific heat of the material of rod
- CThe change in temperature of the rod
- ✓The nature of the metal
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The logic symbols for $OR, NOT$ and $NAND$ gates are respectively 




$(A)$ $(42,56)$ $(B)$ $(48,48)$ $(C)$ $(66,33)$ $(D)$ $(78,39)$
Statement $I$ : Davisson-Germer experiment establishes the wave nature of electrons.
Statement $II$ : If electrons have wave nature, they can interfere and show diffraction.
In the light of the above statements choose the correct answer from the options given below