Asound is recorded at 19 decibels. what is the intensity of the sound?
1 x 10^-8.7 w/m^2
1 x 10^-10.1 w/m^2
1 x 10^-11.9 w/m^2
1 x 10^-9.4 w/m^2

is the intensity of the sound.

Option B

Explanation:

The range of sound intensity that people can recognize is so large (including 13 magnitude levels). The intensity of the weakest audible noise is called the hearing threshold. (intensity about ). Because it is difficult to imagine numbers in such a large range, it is advisable to use a scale from 0 to 100.

This is the goal of the decibel scale (dB).  Because logarithm has the property of recording a large number and returning a small number, the dB scale is based on a logarithmic scale. The scale is defined so that the hearing threshold has intensity level of sound as 0.

Where,

I = Intensity of the sound produced

= Standard Intensity of sound of 60 decibels =

So for 19 decibels, determine I as follows,

When log goes to other side, express in 10 to the power of that side value,

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic

the best answer for these questions would be:

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.