A Noisy Workplace Has a Noise Level of 90 DB

question 38

Multiple Choice

A noisy workplace has a noise level of 90 dB.You want to reduce this to a more comfortable 75 dB.By what factor must the power of the noise source be reduced? (That is,what is the ratio of the new power to the old?)

• A)0.83
• B)0.67
• C)0.32
• D)0.032
• E)0.010