Two speakers are wired to emit identical sounds in unison. the wavelength in air of the sounds is 6 m. do the sounds interfere constructively or destructively at a point 10 m from both speakers?

Costructively

Explanation:

The condition for constructive interference is:

(1)

where

d1 is the distance of the point from the 1st source

d2 is the distance of the point from the 2nd source

n is an integer number

is the wavelength of the wave (in this case, 6 meters)

In this problem, we are considering a point which is 10 m from both speakers, so we have:

And so eq.(1) is satisfied when n=0, which is an integer. Therefore, constructive interference occurs.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.