Regarding noise, which statement is correct_______
A. Musical sounds are not noise under any circumstances
B. A sound with a frequency of more than 90 vibrations per second must be classified as noise
C. To protect sleep and rest, the noise should not exceed 50 decibels
D. Noise can only be attenuated at the source, no other way
Answer:C
Regarding noise, which statement is correct_______
A. Musical sounds are not noise under any circumstances B. A sound with a frequency of more than 90 vibrations per second must be classified as noise C. To protect sleep and rest, the noise should not exceed 50 decibels D. Noise can only be attenuated at the source, no other way