Hearing protection is required if the noise level at any point in the workday reaches 115 db and lasts longer than . a) one hour b) 45 minutes c) 30 minutes d) 15 minutes

D) 15 minutes

The need for hearing protection depends on factors like loudness (measured in decibels), length of exposure to noise, source and the amount of movement between work areas of various noise levels.

It is most likely that the louder the noise, the shorter the exposure time before hearing protection is required. Exposure to a noise as loud as 90 decibels (dB) for an eight-hour workday is the maximum allowable before hearing protection is required. If it reaches 115 dB and lasts longer than 15 minutes, hearing protection will be required.

the interest will be $59.71

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the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.