Question

7. A student finds experimentally that resonance occurs for a particular closed tube at a frequency of 120 Hz. List two other frequencies at which resonance should occur for this tube. (Hint: Assume the student found the fundamental) 8. Initially unpolarized light, with an intensity of ., is sent through 2 polarizing sheets whose polarizing directions are an angle 0 20° to one another. How much intensity will the light have if the after it passes through both polarizers? 9. The intensity of a light source is measured to be 150 W/m. You know that the power consumption of that light source is 5000 W and that 5 % of the used power is converted into light. How far away is light source from you? (Assume no light is scattered or absorbed by air or anything else on the way to your detector.)

Answer 1

a-7 Per a closed tube, fr f 2n-1) v 4& th Lor Bn-1) overtone andin-1)hanmonic Assuming 12o1e 1 harmonic fnemy fundanental as Next freguemiy = 3f resonance 3x120 360 Hz 5fo frugheung Nent resonance ニ SX20 6 00M2