Which is caused when constructive interference occurs in sound waves?
a. louder beats
b. no disturbance
c. softer noises
d. no sounds

When constructive interference occurs in sound waves, it will cause louder beats. The answer is letter A. This is because the waves of the same frequency travel in the same direction. This enables the waves to add up having the same frequency and direction but with greater amplitude.

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

do you have a formula possibly