What is the ratio of distance between L and M orbits in He+1 to the distance between M and N orbits in Li+2? A.5:7 B.15:14 C.2:3

The distance between 4th and 3rd Bohr orbits of He^(+) is :

What is the ratio of the radii of the 3rd orbits of He^(+) and Li^(2+) ?

The distance between the points (m,-n) and (-m,n) is

The ratio of the radius difference between 4^(th) and 3^(rd) orbit of H-atom and that of Li^(2+) ion is :

The distance between points (2,-7,3) and (-2,7,3) is:

An object O is placed in front of a small plane mirror M_(1) and a large convex mirror M_(2) of focal length f . The distance between O and M_(1) is x, and the distance between M_(1) and M_(2) is y. The images of O forned by M_(1) and M_(2) coincide. The magnitude of f is

Find the ratio of the time period of 2^(nd) Bohr orbit of He^(+) and 4^(th) Bohr orbit of Li^(2+)

Two poles of heights 6 m and 11 m stand vertically on a plane ground. If the distance between their feet is 12 m, the distance between their tops is (a) 13 m (b) 14 m (c) 15 m (d) 12.8 m

Two poles of height 6m and 11m stand vertically upright on a plane ground. If the distance between their foot is 12m, the distance between their tops is (a) 12m (b) 14m (c) 13m (d) 11m

The ratio of radii of first orbits of H, He^(+) and Li^(2+) is: