KISS Resources for NSW Syllabuses & Australian Curriculum Worksheet 4 Malus's Law keep it simple science Practice Problems Student Name ..... 3. A beam of light has been passed through a A beam of sunlight which has passed through a polarising filter and its irradiance is measured to be polariser and analyser is found to have a final 250 Wm-2. What is the irradiance value of the beam rradiance value of 188 Wm-2. The filters are aligned after passing through an "analyser" filter which is at 60%. What was the irradiance value just before it aligned at an angle (to the polariser) of: hit the analyser filter? a) 450? b) 750? c) 20? 4. Outline the significance of Young's Experiment (1801) & Malus's Law (1809) on the understanding of the nature of light. 2. At what angle must a polariser & analyser be aligned for the irradiance of a beam of light to be reduced to exactly half of its max value? Worksheet 5 Wien's Law Practice Problems Student Name........ 1. 2. What would be the "peak" wavelength on a What would be the temperature (K) of a "black 'radiation curve", of a "black body" at a body" which has a "peak" wavelength of temperature of: a) 1.5 x 10-7 m? (ultra-violet range) a) 9,000 K ? b) 8.7 x 10-7 m? (infra-red range) b) 5,800 K ? c) 4.2 x 10-7 m? (visible, blue) C) 40,000 K ? d) 6.5 x 10-7 m? (visible, orange) d) 12,000 K? Phys Mod.7 "The Nature of Light" Worksheets page 3 Usage & copying is permitted according copyright @ 2005-19 KEEP IT SIMPLE SCIENCE to the SITE LICENCE CONDITIONS only www.keepitsimplescience.com.au