Question

1. The work needed to remove an electron from the surface of sodium is 2.3 eV. Find the maximum wavelength of light that will cause photoelectrons to be emitted from sodium. What will be the speed of emitted clectrons if light with wavelength 300 nm used? What will be the speed of emitted electrons if light with 2-400 nm is used? low much energy is required to remove an electron from the basic state of hydrogen, thereby producing an ion H 2. H 3. What is the de Broglie wavelength of a 2000-kg car moving at a speed of 100 km/h? 4. In a series of decays, the nuclide U becomes 307 Po. How many a and p particles are emitted in this series? 5. Two narrow slits separated by 0.30 mm are illuminated with light of wavelength 496 nm. (a) How far are the first three bright fringes from the center of the pattern if observed on the screen 100 em distant? (b) How far are the first three dark fringes from the center of the pattem

Answer 1

Probtem: 3 Sol:_ Gtiven thar mass of cor m 2 200 kt, veleuty of the corrloo emh The de broglie wavelength A: 6.63 X153yT, see 2000x100x103 τη , k 3600 sec 34 Problem: 4 Sal 239 239 0 2 8 2 Prroblem: 1 Sel The took nceded to emove om ee fem the Surface of Na Temove am e 1s 2.3e te 2.3 ey le knoo 2.3 ev

*The k-E energy of emitted es if λ= 30mm: h c 15 ev-sa 8 ve sign thow the enersy ronsfer to the El 2.su )9 9.1 x 153 9-1 X16 3