3. Positronium consists of an electron and a positron (a particle which has
the same mass as an electron, but opposite charge) orbiting round their
common centre of mass. Calculate the value of the Rydberg constant for
this system
(a) R12
(6) R14
(c) 2R
(d) R.
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Two figures that have the same shape are said to be similar.
When two figures are similar, the ratios of the lengths of their corresponding sides are equal.
(i) All circles are similar.
Since they have same shape.
(ii) All square are similar.
Since the ratios of the lengths of their corresponding sides are equal.
(iii) All equilateral triangles are similar.
Since the ratios of the lengths of their corresponding sides are equal.
(iv) Two polygons of the same number of sides are similar, if (a) their corresponding angles are equal and (b) their corresponding sides are proportional
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