A we move away from the edge into the geometrical shadow of a straight edge, the intensity of illumination

As we move away from the edge into the geometrical shadow of a straight edge, the intensity of illumination

As we move away from nucleus, the energy of orbit

As we move away from the surface of the earth the air becomes

A lamp is hanging along the axis of a circular table of radius r. at what height should the lamp be placed above the table so that the intensity of illumination at the edge of the table is (1)/(8) of that at its centre ?

If anelectric lamp be suspended at a height h from a circular table of radius r, prove that the intensity of illumination at thecentre of the table is (1+(r^(2))/(h^(2)))^(3//2) times that at the edge of the table.

A ball rolls off the edge of a horizontal table top 4 m high. If it strikes the floor at a point 5 m horizontally away from the edge of the table, what was its speed at the instant it left the table?