Aphoton of wavelength 4 x 10 -7 m strikes on metal surface , the work fuction of the metal being 2.13 ev. calculate (i) the energy of the photon. (ii) the kinetic energy of the emission , and (iii) the velocity of the photoelectron (1ev = 1.602 x 10 -19 j)

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg