Electromagnetic radiations of wavelength 242 nm is just sufficient to ionise sodium atom. Calculate the ionisation energy of sodium in kJ mol^-1.

The shortest wave length in H spectrum of Lymen series when Rh = 109678 cm^1 is

An electron beam can undergo diffraction by crystals. Through what potential should a beam of electrons be accelerated so that its wavelength becomes equal to 1.54 A

The mass charge ratio for A+ ion is 1.97x10^-7 kg C^-1. Calculate the mass of A atom.

AIR service on Vividh Bharati is transmitted on 219 m band. What is its transmission frequency in Hertz?