What is forbidden or energy gap ?
Answer:-
The gap between the top of the valence band and bottom of the conduction band is called the forbidden gap or energy gap.
angle of contact.
It is defined as the angle between the tangent to the liquid surface at the point of contact and solid surface inside the liquid is called as angle of contact The value of angle of contact depends upon (i) Nature of solid and liquid in contact (ii) Cleanliness of the surface in contact (iii) Medium above the free surface of liquid
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