Apoint source emits sound waves of amplitude a. the sound intensity at a distance d from the
source is i. what is the sound intensity at a distance 0.5d from the source when the source emits
waves of amplitude 2a?

The sound intensity is  16I

Explanation:

Given:

Dsitance d = 0.5

Amplitude  = 2A

To Find:

sound intensity = ?

Solution:

We Know that

When Distance is d, wuth amplitude A

The sound intensity ---------------------(1)

Where

C is proportionality constant

Substituting the values

From 1 ,  

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)