The sound intensity level at a seat that is a distance of 2.00 meters from a rock concert stage is 120 dB. (a) Calculate the Intensity, I1 , of the sound in W/m2 at that position. (b) Calculate the sound level in dB at a seat that is 32 meters from the stage, given that the intensity decreases with the square of the distance from the source.

Explanation:

= Intensity of sound at 2 m away

Sound level = 120 dB

= 2 m

= 32 m

= Threshold of sound =

Sound level is given by

The intensity of sound at 2 m away is

The intensity of the sound 32 m away is

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1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.