Calculate the energy per mole of photon of electromagnetic radiations of wavelength 4000Å.

 Related Questions:

(1) On the basis of Heisenbergs uncertainty principle, show that the electron cannot exist within the nucleus.

(2) Atomic radius is the order of 10^-8 cm. and nuclear radius is the order of 10^--13 cm. Calculate what fraction of atom is occupied by nucleus

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

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

(5) 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

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

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

(8) Calculate the number of photon emitted in 10 hours by a 60 W sodium lamp (lemda or photon = 5893 A")

(9) Calculate the longest wavelength which can remove the electron from first Bohrs orbit. Given E1 = 13.6 eV .

(10) Calculate momentum of radiations of wavelength 0.33 nm.