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Please I am in exam. Please answer these questios fast... Q5 Calculate the total sound pressure...

Please I am in exam. Please answer these questios fast...

Q5 Calculate the total sound pressure level caused by a combination of sounds with the following SPLs 20dB+20dB+20dB.

Q6.If the sound 5 meters from the stage at a rock concert is at the 100dB what is the intensity level 10 meters away.

Q7. The intensity of sound from a loud speaker, measured at a distance of 3 meters from the source is 3.0x10--3 W/m2   

(a) Calculate the intensity of the sound at a distance 6 m from the source.

(b) Calculate the decibel change between the two positions.

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