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Comm Diss 311-page11 - 49.(Yes,ofcourse 50.,(No,3 dB...

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49. It is possible to have a sound that is ‐10 dB SPL. (Yes, of course). 50. If two noises with equal dB SPLs are added, the total is 1 additional dB. (No, 3 dB) 51. The statement “That sound is 40 dB” is meaningless without knowing the reference. (True, there needs to be a reference) 52. The statement “That sound is 40 dB SPL” is meaningless because there is no reference. (False, now there is a reference, e.g., 10^‐12 watts/m2). 53. One example of a reference pressure for dB SPL is .0004 dynes/cm2. (No, .0002 dynes/cm2) 54. The number of dB corresponding to an intensity ratio of 40:1 is approximately 16 dB. (Yes, a factor of 10 is 10 dB and two doublings is another 6, or you can just calculate 10log(40) 55. The number of dB corresponding to a pressure ratio of 40:1 is approximately 32 dB. (True) 56. The intensity ratio corresponding to 60 dB is 100,000,000:1. (No, 1,000,000:1) 57. If everyone sings at the same level, a chorus with 100 singers should make 10 more dB than a chorus with 5 singers. (No 10 log (100/5) is 13 dB).
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