An e.m. radiation has an energy 1 keV. To which regino of e.m. spectrum does it long? `(Given h = 6.6 xx 10^(-34) Js and 1 eV = 1.6 xx 10^-36)`

Find out the vlaue of 1 Bohr magneton. Givne h = 6.62 xx 10^-34 J s, e = 1.6 xx 10^-19C and m _e = 9.1 xx 10^-31 kg

If high waves of frequency 8.8 xx 10^(14) Hz is incident on a metal surface of thresold frequency 4 xx 10^(14) Hz, then determine the value of stopping potential (cut-off Potential) (Given h=6.6 xx 10^(-34) Js and e = 1.6 xx 10^(-19)C)

calculate the frequency of a photon of energy 3 eV. Givem h=6.62 xx10^(-34) Js.