Compound X exhibits molar extinction coefficient of 245 m2mol at 450 nm. What concentration of X in a solution will cause a 25% decrease in the intensity of 450 nin radiation when the solution is placed in a 0.01 m absorption cell ?
Calculate the frequency of the radiation required to eject photoelectrons to a velocity of 9 X105 MS-1 from sodium metal surface, having a threshold frequency of 4.61 x 1014 Hz (mass of photoelectron = 9.109 x 10 -31 kg).