Calculate the longest wavelength of the Paschen series spectrum. (Rydberg constant `= 1.97 xx 10^7 xx 10^7 m^-1)`

Calculate the longest wavelength of the Balmer series spectrum

Calculate the shortest and longest wavelength of Balmer series. (R = 1.1 xx 10^7 m^-1) . In which region of em spectrum do these two wave lengths lie?

Calculate the de Brogilie wavelength of a proton having kinetic energy 50 eV. (m_p = 1.67 xx 10^-27 kg. h = 6.62 xx 10^34J-s)

Calculate de Broglie wavelength of an electron (m = 9.1 xx 10^-31kg) moving with a velocity of 10^5 m//s .

Calculate the wavelength, frequency and wave number of a light whose period 2.0 xx 10^(-10) s .