Assignment 11 - Western Canada Senior High School PHYSICS 30

Physics 30: Assignment 11 1 58 Marks Total ASSIGNMENT 11 Part One: Blackbody Radiation and the Quantum Part One of this assignment is worth 27 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. (3) 1. Describe the pattern of intensity vs wavelength observed in blackbody experiments and explain why these observations were in conflict with the prediction of classical physics. Answer: (2) 2. What is the frequency of a 13.0 eV photon? Answer: (2) 3. What is the wavelength of a 4.30 x 10-19 J photon? Answer: (4) 4. How many photons with a wavelength of 532 nm are released each second by a 5.0 mW laser? Answer: (2) 5. When welders are working on pipelines they wear filters that block UV light. Why is this safety precaution necessary?