Divergence of a vector at a point in a vector field is __________ quantity.
Divergence at a point is positive if field lines are _________
The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122nm. The smallest wavelength in the infrared region of the hydrogen spectrum (To the nearest integer)is:
In the Spectrum of hydrogen atom, ratio of the longest wavelength in layman series to the longest wavelength in Ballmer series is: