Question

Question 17 5 pts The work function of potassium metal is 2.30 eV. Monochromatic light is shined on its surface, and photoelectrons with a maximum speed of 7.50E5 m/s are ejected. What is the wavelength of the light? O 539 nm O 657 nm 0 393 nm O 319 nm 1443 mm Question 18 5 pts When Dr. Bruce Banner becomes angry and undergoes a transformation into the Incredible Hulk, his blood plasma becomes saturated with Na-24 atoms. These radioactive sodium atoms decay into stable Mg-24 by beta decay, along with the release of two high-energy gamma rays, to which Dr. Banner is immune. After initially becoming angry and transforming into the Hulk, how long will it take so that only 15% of the Na-24 atoms remain in his blood plasma? The halt-life of Na-24 is 15 hours 15 hours 41 hours 36 hours 50 hours 61 hours

Answer 1

Questions No:17 woskfonction (0) = 2.300den V= 7.50 x 10 ml an photo betic effect. E-P KE mox - mua hc - ф d X16X10 -Q30) 0:54 9.18109317 8.50 2to) ? 240 - 200 1200 -8.30 = 10559960 d 1200, 3,8996 d a = 317.98hm da hey ble Ans