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Physics 30: Assignment 16 1 52 Marks Total ASSIGNMENT 16 Part One: Cathode Rays and Thomson’s Experiment Part One of this assignment is worth 25 marks. The value of each question is noted in the left margin in parenthesis. Note: The answer areas will expand to fit the length of your response. (2) 1. What was the evidence that the cathode rays were particles with charge and mass? Answer: Cathode rays would cause the glass to glow when they stuck the side of a tube and they could be deflected by a magnetic field. Therefore, it was suggested that the rays must be streams of negatively charged particles. (3) 2. What is the charge to mass ratio of a particle travelling 3.60 x 106 m/s that is deflected in an arc or radius 7.40 cm as it travels through a magnetic field of 0.610 T? Answer: (3) 3. Some positively charged particles passed un-deflected through perpendicular magneticPhysics 30: Assignment 16 2 and electric fields. If the magnetic field strength was 0.650 T and the electric field strength was 2.10 x 105 N/C, what was the speed of the particles? Answer: (3) 4. Alpha particles travel through a magnetic field of 0.360 T and are deflected in an arc of 0.0820 m. Assuming the alpha particles are travelling perpendicular to the field, what is the kinetic energy of an individual alpha particle? Answer:Physics 30: Assignment 16 3 (3) 5. Using the charge of an electron (determined by Millikan in another experiment to be 1.60 x 10-19 C) and the charge to mass ratio of the electron (determined by Thomson to be 1.76 x 1011 C/kg), calculate the mass of an electron. Answer: 6. A particle accelerated by a potential difference enters a velocity selector which consists of perpendicular magnetic and electric fields. The particle travels straight when the magnetic field is 0.400 T and the electric field is 6.30 × 105 V/m. Once the electric field is turned off, a sensor determines that the radius or the particle’s path is 4.11 cm. (3) a. What is the charge-to-mass ratio of this particle? Answer: (4) b. Calculate the charge-to-mass ratio of an alpha particle, electron and proton. Identify the particles used in the experiment from the calculations. Hint: check your data booklet for the charges and masses. Answer:

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