Photoelectric effect.
Photoelectric effect is the phenomenon in which electrons are knocked off a metal surface when light is incident on it. The metal is said to be a photosensitive material and the liberated electrons are called photoelectrons.
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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