6 and U = 2. (a) A siren has a sound power of 4 +T watts. Given Irer = 10-12 W/m2 and at distance, r= 100 x U meters: Q2 (1) Calculate the sound pressure in decibels based on the intensity The values of I and U depend on the respective 5th and 6th digits of your matric number as shown in Table Q2. For example, if your matric number is ADT70154 gives the value of T = 6 and U = 2 (4 marks) (11) Determine whether the siren will be heard at the distance, r= 100 x U meters or not? (2 marks) (6) Sound Power Level. Lw is measured as the total acoustic power emitted by a source in all directions (does not change with the environment) to a reference value that is typically 10-12 W. Estimate the sound power level of a siren that emits 2 * I * U watts and justify your answer based on the noise level chart. (4 marks) (c) There are three noise sources where each of them operates at 90+ I dB(A) together in the same room. 1) Examine the noise level in the room using the exact calculation method. (3 marks) (11) Analyze the sound pressure generated in the room. (3 marks) (d) An employee who works during 8-hour shift in a station is exposed to a noise level of 80+T + U dB(A). 1) Calculate the OSH (Noise Exposure) daily personal noise dose percentage (3 marks) (11) Analyze the permissible hours that the employee can perform the work according to the OSH (Noise Exposure) Regulations 2019 noise exposure limit of 85 dB(A) (3 marks) (e) Determine the Sound Pressure Level, SPL at 20 + I meters from a speaker in a reverberant room if the SPL measured at 5+U meters from the source is 100 dB(A). 6 and U = 2. (a) A siren has a sound power of 4 +T watts. Given Irer = 10-12 W/m2 and at distance, r= 100 x U meters: Q2 (1) Calculate the sound pressure in decibels based on the intensity The values of I and U depend on the respective 5th and 6th digits of your matric number as shown in Table Q2. For example, if your matric number is ADT70154 gives the value of T = 6 and U = 2 (4 marks) (11) Determine whether the siren will be heard at the distance, r= 100 x U meters or not? (2 marks) (6) Sound Power Level. Lw is measured as the total acoustic power emitted by a source in all directions (does not change with the environment) to a reference value that is typically 10-12 W. Estimate the sound power level of a siren that emits 2 * I * U watts and justify your answer based on the noise level chart. (4 marks) (c) There are three noise sources where each of them operates at 90+ I dB(A) together in the same room. 1) Examine the noise level in the room using the exact calculation method. (3 marks) (11) Analyze the sound pressure generated in the room. (3 marks) (d) An employee who works during 8-hour shift in a station is exposed to a noise level of 80+T + U dB(A). 1) Calculate the OSH (Noise Exposure) daily personal noise dose percentage (3 marks) (11) Analyze the permissible hours that the employee can perform the work according to the OSH (Noise Exposure) Regulations 2019 noise exposure limit of 85 dB(A) (3 marks) (e) Determine the Sound Pressure Level, SPL at 20 + I meters from a speaker in a reverberant room if the SPL measured at 5+U meters from the source is 100 dB(A)