what is the name of the series in hydrogen spectrum after Humphreys series..???

se the Rydberg formula, which gives you the wave length of the photons emitted by the jump from level n to level n=6 (which is 5th level about ground state n=1):

1/? =RH· ( 1/(6)² - 1/n² )
RH = 1.0967758×10^7m^-1 is theRydberg Constantfor hydrogen
=>
1/(RH ·?) = ( 1/36 - 1/n² )
n = 1/v[ 1/36 - 1/(RH·?) ]
= 1/v[ 1/36 - 1/(1.0967758×10^7m^-1 · 5924×10^-9m) ]
= 9

The series contains the following jumps (starting from the lowest energy):
7-->6 , 8-->6, 9-->6, 10-->6, etc.

Thus this photon represents the third lowest energy spectral line of the Humphreys series.