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Sir Winston Churchill High School ,Physics 30: Assignments<FROM ASSIGMENT 10, 11, , 14, 16, 17>ALL ANSWERS VERIFIED, 100% CORRECT

Physics 30: Assignment 10 Part One: Electromagnetic Radiation Part One of this assignment is worth 11 marks. The value of each question is noted in parentheses in the left margin. Note: The answer ... areas will expand to fit the length of your response. 1. (1) Medical technologies related to imaging and cancer treatment use high-frequency EMR. a. Explain why high frequency EMR is harmful. Answe r: (1) b. What precautions should medical personnel take when working with these types of technologies? Answe r: 2. A student measures the period of an electromagnetic wave as 3.64 x 10-15 s. (1) a. What is the frequency of the wave? Answe r: (1) b. What is the wavelength of the wave? Answe r: (1) c. To which part of the electromagnetic spectrum does the wave belong? Answe r: 3. Two competing models explaining electromagnetic radiation are the wave model and the particle model. Complete the two statements below by filling in the missing word(s). a. Regarding the wave model, the greater the intensity, the larger the _____ of the Physics 30: Assignment 11 Part One: Reflection Part One of this assignment is worth 23 marks. The value of each question is noted in parentheses in the left margin. Note: The answer areas will expand to fit the length of your response. (1) 1. The law of reflection is one of the most basic of all laws in optics; it relates the angle of incidence to the angle of reflection. State the law of reflection. Answer: The law of reflection states that on a plane mirror, the angle of incidence is equal to the angle of reflection, relative to the normal. 2. Draw a ray diagram for each, and then use the diagram to predict if the images are  real or virtual  erect or inverted  larger, smaller, the same size, or not formed  on the same side of the mirror as the objects or on the opposite side (2) a. An object is placed at F in front of a converging or concave mirror. List the image characteristics below. (Note the focal length is positive for converging mirrors in the simulation.) Answer: No image is formed (2) b. An object is placed between F and the surface of a converging or concave mirror. List the image characteristics below. (Note the focal length is positive for converging mirrors in the simulation.)Physics 30: Assignment 11 2 Answer: Virtual Erect Larger On the opposite side (2) c. An object is placed very far away from a diverging or convex mirror (far left on the simulation). List the image characteristics below. (Note the focal length is negative for diverging mirrors in the simulation.) Physics 30: Assignment 13 Part Two: The Photoelectric Effect Part Two of this assignment is worth 31 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. 1. (3) While conducting research into the design of a light sensor, scientists measured the kinetic energy of photoelectrons that had been ejected from an unknown metal surface. The metal was exposed to various frequencies of EMR and the stopping voltage was measured to obtain the kinetic energy of the photoelectrons. The following data was obtained. Incident EMR frequency x 1014 Hz Kinetic energy of photoelectrons (eV) 6.0 0.38 7.0 0.80 8.0 1.20 9.0 1.63 10.0 2.04 a. Using the data above, plot a kinetic energy vs. frequency graph and use it to answer questions b – e.Physics 30: Assignment 13 6 Answe r: (2) A. According to your graph, what is the threshold frequency of the unknown metal? Label the threshold frequency on your graph. Answe r: The threshold frequency of the graph is the x-intercept of the graph. Therefore, the threshold frequency of the graph is approximately 5.4x1014Hz. (2) b. Determine the work function of the unknown metal. Answe r: The work function of the metal is W=hfo h= 4.14x10-15 eVs fo= 5.4X1014HZ W= hfo W= (4.14x1015 eVs)(5.4x1014 Hz) W= 2.2 eV (1) c. Using the tables below, identify the unknown metal.Physics 30: Assignment 13 7 Elemen t Aluminu m Berylliu m Cadmiu m Calciu m Carbo n Cesiu m Copper Work Functio n (eV) 4.08 5.00 4.07 2.90 4.81 2.10 4.70 Elemen t Magnesiu m Mercury Potassiu m Seleniu m Sodiu m Zinc Work Functio n (eV) 3.68 4.50 2.30 5.11 2.28 4.33 Answe r: Based on the work function of the unknown metal, it is most likely sodium (work function is 2.2356 eV). (3) d. Explain how to find Planck’s constant from your graph then, using your graph, determine the experimental value for Planck’s constant in eVs. Answe r: The Planck’s constant can be found by calculating the slope of the graph. m= y2−y1 x2−x1 = 2.04eV −0.38eV 10.0 x1014 Hz−6.0x 1014 Hz =4.15 x10−15eV [Show More]

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