Sun and earth revolve around a common center of mass with period of revolution T. If M1 and M2 are the masses of the sun and the earth respectively and ‘a’ is the separation between them, then prove that
M1+M2=(4pi^2)a^3/GT^2

50.)the diagram below represents the wave fronts produced by a point source moving to the right in a uniformmedium. observers are located at points a and b.compared to the wave frequency and wavelength observed at point a, the wave observed at point b has a(1) higher frequency and a shorter wavelength(2) higher frequency and a longer wavelength(3) lower frequency and a shorter wavelength(4) lower frequency and a longer wavelength