Electromagnetic Radiation of wavelength 242 nm is just sufficient to ionize the sodium atom. Calculate the ionization energy sodium in kJ `"mol"^(-1)`.

For a metal the maximum wavelength required for photoelectron emission is 340 nm, find the work function. If the radiation of wavelength 250 nm falls on the surface of the given metal. Find the maximum kinetic energy of emitted photo electrons in eV. Given Planck's constant = 6.625 xx 10^(-34) Js , velocity of light in vacuum is 3 xx 10^(8)ms^(-1) .

Calculate the frequency of electromagnetic radiation having the wavelength 3 mu . Calculate the wave number corresponding to it. ( 1 mu = 10^(-6) m)

Heat of neutralisation of a weak acid HA by NaOH is -"12.13 kJ mol"^(-1) . Calculate the enthalpy of ionization of HA.

The threshold wavelength of a photosensitive metal is 662.5 nm. If this metal is irradiated with a radiation of wavelength 331.3 nm, find the maximum kinetic energy of the photoelectrons. If the wavelength of radiation is increased to 496.5 nm, calculate the change in maximum kinetic energy of the photoelectrons. (Planck's constant h = 6.625 xx 10^(-34) Js and "speed of light in vacuum" = 3 xx 10^(8)ms^(-1) )

Ultraviolet radiations of wavelengths 800 Å and 700 Å when allowed to fall on Hydrogen atoms in their ground state, were found to liberate electrons with maximum kinetic energies 1.96 eV and 4.18 eV respectively. Calculate Planck,s constant and work function or ionisation energy of the hydrogen atom.

The minimum energy in electron volt required to strip off ten times ionized sodium atom (i.e, Z = 11) of its last electron is