Questions Use the following information to answer the next question Questions A beam of 4.42 x 10:1 m X-rays strike a metal plate causing the ejection of electrons as shown in the diagram below. 18. Violet light striking the negative electrode in a phototube causes a current to flow in 16. Planck introduced the idea of the quantum nature of light in order to the tube. Under the same conditions, another form of light that will always cause a current to flow in the same tube is metal plate account for the wave nature of the electron infrared Scattered X-rays account for the behaviour of black body radiation green 4 42 x 10 X-ray's 13241 support Maxwell's theory of electromagnetism blue support the concept of a nuclear atom ultraviolet Questions 21. Determine the wavelength of the scattered X-rays. 4.54 x 10-11 m Questions 20. X-rays having a wavelength of 5.00 x 10 1 m strike a metal plate and eject 4 44 x 1011 m electrons along with scattered X-rays having Determine the speed of the ejected placewavelength of 8.00 x 10-# m. 19. When a certain metal is struck by a photon with a frequency of 8.23 x 1014 Hz. the 4.40 x 10:11 m metal emits an electron with a maximum speed of 2.45 x 105 m/s. The work function for this metal is eV. (Record your three digit 1.49 x 1015 m/'s 2.11 x 10-13 m answer.) 5.72 x 107 m's Maximum Kinetic Energy of Photoelectrons as a Function of Incident Electromagnetic Frequency Your answer: WOO 3.27 x 1015 m/'s 1.19 x 10 ml 24. The equation hf = ge Vstop + W for the photoelectric effect is derived using the physics principle of conservation of 25. An alpha particle travelling at 3.12 x 105 m/'s has the same m with a wavelength of tum as a photon charge 3.20 x 10-13 m Maximum kinetic energy (10 " energy 3.13 x 1012 m nucleons 7.86 x 1011 m momentum 1.27 x 10-13 m Use the following information to answer the next question Classical wave theory and quantum physics make different predictions about the Frequency (10" He) effect of incident electromagnetic radiation on a photoelectric surface. 22. The work function of the material emitting the photoelectrons is Four Photoelectric Effect Predictions 1. The energy of the emitted photoelectrons will increase if the intensity of the 1.3x 10.18 J incident electromagnetic radiation is increased. 2. The energy of the emitted photoelectrons is independent of the intensity of the 10.0J incident electromagnetic radiation. 6.6 x 10:34 J 3. Low-intensity electromagnetic radiation incident on a photoelectric surface for long periods of time will cause photoemission. 20 x 1015 J 4. High-intensity electromagnetic radiation will not cause photoemission unless its frequency is greater than the photoelectric surface's threshold frequency. 23. Which predictions related to the classical wave theory? 1 and 4 1 and 3 2 and 3 D 2 and 4
