You are given information on the intensity level (which is a measure of the sound intensity) at a point and its distance from the sound source. to make use of this information, you will need to determine the relation between sound intensity and distance from the source. which of the following statements correctly expresses that relation?
a) the intensity at any distance r is directly proportional to r.
b) the intensity at any distance r is directly proportional to r^2.
c) the intensity at any distance r is inversely proportional to r.
d) the intensity at any distance r is inversely proportional to r^2.
e) the square of the intensity at any distance r is directly proportional to r.
f) the square of the intensity at any distance r is inversely proportional to r.

d) The intensity at any distance r is inversely proportional to r².

Explanation:

The power per unit area is know as intensity of the sound.

The dimension of power is W so the dimension of the intensity will be W/m².

The sound intensity (I) at any distance r given related as

Intensity I is inversely proportional to r²

p=Pressure

So we can say that

So the option d is correct.

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force