Question: 2. It is given that the sound intensity level B (in dB) of a sound is defined as =10log () where I is the sound

2. It is given that the sound intensity level B (in dB) of a sound is defined as =10log () where I is the sound intensity (in W/m ) measured and I =10 w/m . (a) The sound intensity level of a vacuum cleaner is 75 dB. If the sound intensity of the noise from an air-conditioner is 1 1000 of the noise from the vacuum cleaner, find the sound intensity level of the air-conditioner. (3 marks) ( b ) The sound intensity levels in the study room and at home are 45 dB and 55dB respectively. Find the ratio of the sound intensity in the study room to that at home. (4 marks)

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