Long waves.
Answer:-
These are the waves having longest wave-length(of the order of 10⁶cm) existing on a.c. power lines.In homes we get a.c. power supply at 50Hz. Most of the energy is confined to power line, very little is radiated into space.
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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