11. (3 points) Dr. Weaver has guest-lectured twice this semester. If we were to

Question

11. (3 points) Dr. Weaver has guest-lectured twice this semester. If we were to map his distinctive voice, which is easy to hear at any location in the lecture hall, to an analogous light source, what would that light source be? (a) A dim blue light. (b) A bright blue light. (c) A dim red light. (d) A bright red light 12. (3 points) Bramlage Coliseum basketball games are too loud for kids (and adulta), and many people who bring young children have them wear moise reducing ear muffs that can knock sound intensities down by 25 dB. What factor of reduction does this translate to in ordinary numbers? (a) 3.2 (b) 25. (c) 250 (d) 316 13. (3 points) How much louder would the K-State Cat Band's rendition of Jimi Hendrix's Purple Haze get as you moved from 25 m away from the band to 10 m away? Actim' funny, but I don't know why... Excuse me while I kiss the sky! (a) 2.5x. (b) 6.25x. (c) 316x. d) Not loud enough! (You're tempted...don't do it!) 14. (3 points) What would the difference be between viewing an unpolarized light source through a single piece of Polaroid filter vs. directly with your naked eye? (a) The Polaroid would block all the light for any orientation. (b) The Polaroid would block between 50-100% of the light, depending on its orientation. (c) The Polaroid would block about half the light for any orientation. (d) The Polaroid would block between 0-50% of the light, depending on its orientation.

Explanation / Answer

11] Energy of a photon is given by: E = hv

where v is the frequency of the photon. Since the frequency of Blue light is higher than that of Red light, Blue photon is more energetic than a Red photon.

Therefore, the mapping would be a Brighter Blue light. [option b].

12] The factor f (in integer) will be given by:

25 (in dB) = 10log(f)

=> f = 1025/10 = 316 [option d].

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